NOAA Technical Memorandum NMFS-AFSC-49
Data Report: 1990 Gulf of Alaska Bottom Trawl Survey
by J. W. Stark and D. M. Clausen
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Marine Fisheries Service Alaska Fisheries Science Center
January 1995 NOAA Technical Memorandum NMFS
The National Marine Fisheries Service's Alaska Fisheries Science Center uses the NOAA Technical Memorandum series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible. Documents within this series reflect sound professional work and may be referenced in the formal scientific and technical literature.
The NMFS-AFSC Technical Memorandum series of the Alaska Fisheries Science Center continues the NMFS-F/NWC series established in 1970 by the Northwest Fisheries Center. The NMFS-NWFSC series will be used by the Northwest Fisheries Science Center.
This document should be cited as follows:
Stark, J. W., and D. M. Clausen. 1995. Data Report: 1990 Gulf of Alaska bottom trawl survey. U.S. Dep. Commer., NOAA Technical Memorandum NMFS-AFSC-49, 221 p.
Reference in this document to trade names does not imply endorsement by the National Marine Fisheries Service, NOAA. NOAA Technical Memorandum NMFS-AFSC-49
Data Report: 1990 Gulf of Alaska Bottom Trawl Survey
by J. W. Stark 1and D. M. Clausen2
1Resource Assessment and Conservation Engineering Division Alaska Fisheries Science Center 7600 Sand Point Way N.E., BIN C-15700 Seattle, WA 98115-0070
2Auke Bay Laboratory Alaska Fisheries Science Center 11305 Glacier Highway Juneau AK 99801-8626
U.S. DEPARTMENT OF COMMERCE Ronald H. Brown, Secretary National Oceanic and Atmospheric Administration D. James Baker, Under Secretary and Administrator National Marine Fisheries Service Rolland A. Schmitten, Assistant Administrator for Fisheries
January 1995 This document Is available to the public through:
National Technical Information Service U.S. Department of Commerce 5285 Port Royal Road Springfield. VA 22161 Notice to Users of this Document
This document is being made available in .PDF format for the convenience of users; however, the accuracy and correctness of the document can only be certified as was presented in the original hard copy format.
iii
ABSTRACT
The third triennial groundfish assessment survey of the Gulf of Alaska was conducted during the summer of 1990 by the Alaska
Fisheries Science Center's Resource Assessment and Conservation
Engineering (RACE) Division and the Auke Bay Laboratory (ABL).
Two chartered trawlers, the Pat San Marie and Green Hope and the
National Oceanic and Atmospheric Administration research vessel
Miller Freeman successfully sampled 708 survey stations in the
Gulf of Alaska from the Islands of Four Mountains (1700W long.) to Dixon Entrance (133°25'W long.) in depths less than 500 m using standard RACE Division Nor'eastern high-opening bottom trawl nets with rubber bobbin roller gear. This document combines the results of the RACE and ABL surveys.
The survey design divided the overall Gulf of Alaska survey area into 49 strata based on bathymetric and geographic features to produce a standard survey area totaling approximately
87,000 square nautical miles (nmi2) (296,700 km2) ranging in bottom depth from 1 to 500 m. Trawl samples were allocated among strata in proportion to fish densities observed during the 1984
U.S.-Japan triennial survey. Stations were selected randomly from a 5 by 5 nmi grid of numbered points, superimposed over each stratum. The bottom area swept during each trawl haul was determined from an acoustic trawl mensuration system and Loran navigational equipment.
The species composition was determined for each catch and the principal species were sampled for sex, length, individual iv weight and age distributions.
Seawater temperatures were collected during trawling operations. Ancillary collections included specimens for diet studies, juvenile walleye pollock (Theraqra chalcoqramma) distribution and predator studies, skate taxonomic delineation, fishery observer training and marine mammal prey studies and sightings.
Results include a ranking of catch abundance for the 20 most abundant species, abundance estimates of the principal fish species, distribution, and size composition by geographic location and depth and length versus weight regression parameters. Age composition data are included for walleye pollock and Pacific ocean perch (Sebastes alutus). Seawater surface and bottom temperature data are presented by area.
Appendices contain the survey trawl specifications and diagram, strata definitions and charts, list of species encountered and length-weight relationships of the principal species.
Arrowtooth flounder (Atheresthes stomias), walleye pollock,
Pacific halibut (Hippoqlossus stenolepis) and Pacific cod
(Gadus macrocephalus) were the dominant species throughout the survey area. The rockfish, sablefish (Anoplopoma fimbria), soles and other species were locally abundant in some areas. Red squid
(Berrvteuthis maqister) was the most abundant invertebrate throughout the survey area. v
CONTENTS
Introduction 1
Methods 3 Vessels and Gear 3 Survey Area 4 Sampling Design 8 Western and Central Gulf of Alaska 8 Eastern Gulf of Alaska 10 Overall Gulf of Alaska 12 Collection and Processing of Samples 13 Data Analysis 16 Results 19 Water Temperature Distribution 26 Overall Abundance and Distribution of Major Fish Groups 32 Principal Fish Species Abundance, Distribution and Size Composi tion 35 Arrowtooth flounder 36 Pacific halibut 42 Flathead sole 48 Rock sole 54 Rex sole 60 Dover sole 66 Yellowfin sole 72 Walleye pollock 78 Pacific cod 84 Sab Iefish 90 Pacific ocean perch 96 Northern rockfish 102 Rougheye rockfish 108 Dusky rockf ish 114 Sharpchin rockfish 120 Shortraker rockfish 126 Shortspine thornyhead 132 Other rockfish 138 Other flatfish 148 Skates 153 Smelt 155 Pacific herring 155 Atka mackerel 155 Red squid 155 Age Composition Data 161
Ci tations 164
Appendix A Gear Specifications and Diagram 165
Appendix B Strata Specifications and Charts 167
Appendix C List of Animal Species Encountered 176
Appendix D Length-Weight Regressions for Major Species 185
Appendix E Catch Per Unit of Effort and Biomass Estimates by Strata for Principal Species 199
vii
PREFACE
This data report is one of three types of standard reports presenting data from the 1990 Gulf of Alaska groundfish survey conducted by the National Marine Fisheries Service (NMFS). These reports are:
1) A Cruise Report1, outlining the survey objectives, documents itinerary, personnel, vessels employed and summarizes major accomplishments.
2) A Report to Industryl, containing a fishing log consisting of raw haul and catch data for each haul made during the survey, catch summaries for the major species catch per unit effort by haul and gear specifications and diagram.
3) A Data Report (this document), containing detailed descriptions of the survey planning and operation, species distribution and abundance charts, length frequency plots, tables of estimated biomass, catch per unit of effort, average weight and length estimates, length frequency plots, length-weight regression parameters, sea temperature charts, list of species, survey strata specifications and charts, trawl descriptions and diagrams.
lCentral and western Gulf of Alaska survey area reports are available from Director, Resource Assessment and Conservation Engineering Division, Alaska Fisheries Science Center, National Marine Fisheries Service, 7600 Sand Point Way N.E., Building 4, BIN C15700, Seattle, WA 98115-0070. Eastern Gulf of Alaska survey area reports are available from Director, Auke Bay Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, 11305 Glacier Highway, Juneau, AK 99801-8626
INTRODUCTION
The third in a series of triennial groundfish surveys was conducted in the Gulf of Alaska (GOA) during the summer of 1990 by the National Marine Fisheries Service's (NMFS) Alaska
Fisheries Science Center (AFSC). Survey design and operations were the responsibilities of scientists from the AFSC's Seattle based Resource Assessment and Conservation Engineering (RACE)
Division for the western and central GOA (Islands of Four
Mountains to Cape St. Elias). The eastern GOA (Cape St. Elias to
Dixon Entrance) was the responsibility of the AFSC's Auke Bay
Labor~tory (ABL) located in Juneau, Alaska. This report presents the combined survey results for the principal fish species in each of the five GOA International North Pacific Fisheries
Commission (INPFC) statistical areas: Shumagin, Chirikof, Kodiak,
Yakutat, and Southeastern. The purpose of this report is to provide fishery resource managers with results of the two 1990
GOA groundfish surveys, to supplement the status of stocks resource assessment and allocation process. This report presents the 1990 survey results only and makes no comparisons with previous GOA surveys.
The survey objectives were to:
1) Delineate the distributions of major groundfish and commercially important invertebrate species inhabiting the Gulf of Alaska between the inner continental shelf and upper
continental slope in water depths to 500 m.
2) Collect data to estimate the abundance of the major groundfish species. 2
3) Collect data to define biological parameters for size, sex and age composition, growth, length-weight relationships and reproductive condition.
4) Collect accurate trawl performance data for all survey nets and vessels.
5) Conduct cooperative sampling with other research organizations. 3
METHODS
Vessels and Gear
Cape St. Elias divided the GOA survey area into a western portion sampled by two chartered trawlers and an eastern portion sampled by a NOAA research vessel. The chartered vessels were house-forward style u.S. commercial stern trawlers, the 30.8 m
Pat San Marie and 30.5 m Green Hope powered by 850 and 565 horsepower (hp) main engines, respectively. Both chartered vessels employed dual hydraulic trawl winches mounted forward on the working deck and single net reels over the stern ramp. The trawl cable length was 1,100 m on the Pat San Marie and 1,463 m on the Green Hope with respective diameters of 2.2 cm and 1.91 cm. Navigation and fishing electronics included Loran C receivers and plotter, fish imaging and depth sonars with paper and color video recorders and net sonde units.
The NOAA research vessel was the 65.5 m stern trawler Miller
Freeman powered by a 2,250 hp main engine and auxiliary 400 hp bo'w thruster. Constant-tension hydraulic trawl winches contained
1,830 m of 2.54 cm diameter wire cable. Fishing electronics included SATNAV and Loran C receivers and plotter, fish imaging paper and color video depth sonars and net sonde units.
All vessels used the standard RACE Division four-seam high-opening polyethylene Nor'eastern trawl equipped with rubber bobbin roller gear (Appendix A). The Nor'eastern trawl has a
27.2 m headrope and 36.7 m foot rope consisting of a 24.9 m center 4
section and adjacent 5.9 m "flying wing" extensions. Triple
54.9 m dandylines attached the Nor'eastern trawl to two 1.8 by
2.7 m steel V-doors weighing 0.8 metric tons (t) each.
The Nor'eastern trawl's vertical and horizontal opening was monitored on each vessel by an acoustic link net mensuration system employing headrope and wing transducers. The 'net's path width as measured between the wing tips generally increased with increasing trawl cable length and averaged 15.7 m for the Pat San
Marie, 14.9 m for the Green Hope and 15.0 m for the Miller
Freeman. The trawling speed averaged approximately 3 nautical miles per hour (nmi/h) for all vessels.
Survey Area
The Gulf of Alaska forms the northeastern border of the
Pacific Ocean and is comprised of complex bathYmetric features ranging from jagged mountainous pinnacles to flat muddy areas.
The features provide a wide variety of habitats resulting in a complex ecosystem (Fig. 1). Prevailing rough bottom conditions in many areas require the standard use of rubber bobbin roller gear for all bottom trawling operations. The 1990 GOA survey included the entire continental shelf and upper portion of the continental slope to the 500 m depth contour, excluding all the
Southeastern INPFC area's generally untrawlable shallow (1-100 m) inner shelf.
The total survey area was approximately 296,700 km2
(87,000 nmi2, Table 1). The shelf, comprising over 90% of the 5 total GOA survey area, extends approximately 220 km (120 nmi) off
Cook Inlet and narrows to 40 .km (22 nmi) off Dixon Entrance and
20 km (11 nmi) off the Islands of Four Mountains. Approximately
80% of the shelf is shallower than 200 m. The remaining shelf are~ is bisected by numerous gullies, 100-500 m in depth, extending from the upper slope to the inner shore. The outer shelf is bordered by the continental slope, a region approximately 10 nmi in width, which descends steeply into the abyssal Aleutian Trench in the western and central GOA and the
Alaska plain in the eastern GOA. The survey assessed only that portion of the slope shallower than 500 m, an area of approximately 15,000 km2 (8,000 nmi2).
The Kodiak INPFC area with 97,530 km2 (Table 1) has over 35% more total bottom area than any other GOA area. The Chirikof
INPFC area totals 63,460 km2, only 1% smaller than the Shumagin
INPFC area (64,160 km2), while the Yakutat INPFC area has approximately 53,810 km2 in bottom area. The Southeastern INPFC area's bottom area (21,560 km2, including the unsurveyed 1-100 m areas) is only 20% of the size of the Kodiak INPFC area. Y;:'~:":"',-- ,,;.:,:'~ 60° N ''''''''',".'.,-.,'' ~"<•••••.<. .
Bering Sea 58° N
",
56° N a'\
(\ \
54° N Gulf of Alaska
170° W 165° W 160° W 155° W 1500W
Figure 1.--Bathymetric and geographic features of the Gulf of Alaska groundfish survey area. 60° N
58° N
Gulf of Alaska
56° N -..]
54° N
1500W 145°W 1400W 135°W
Figure 1.--(continued) Bathymetric and geographic features of the Gulf of Alaska groundfish survey area. 8
Sampling Design
The 1990 triennial survey design, first used for the 1984 triennial survey (Brown 1985) and again for the 1987 survey
(Stark 1988), was based on stratified random sampling. The design objective was to minimize the variances of biomass and population estimates. For the 1990 survey, the Gulf of Alaska was divided into 49 strata categorized by water depth, type of geographical area (e.g. banks, gullies, and slopes) and INPFC statistical area boundaries (Appendix B) . Station locations were allocated for each stratum from a grid of points laid over the survey area. Each point in the grid was 5 nmi from adjacent stations along lines of latitude and longitude.
The original 320,648 km2 survey area was reduced by
20,130 km2 (7%) from the 1984 and 1987 surveys' coverage to include only depths shallower than 500 m. The reduced sampling area was due to a loss of available vessel time related primarily to the suspension of Japanese participation in the survey. Western and Central Gulf of Alaska
Sample allocation was determined following the method of
Neyman for stratified random surveys, (Cochran, 1977). Each stratum was assigned a sampling density, based on the geographical and bathymetric distribution of variances of abundance estimates for selected species from the 1984 triennial survey. Sampling allocation for a stratum with anticipated high fish densities designated one out of every four points on the grid (grid points). Strata expected to have moderate fish 9 densities were assigned one out of six grid points. Strata expected to harbor low fish densities were allocated one out of nine grid points. After the number of stations were determined for each stratum, a corresponding number of grid points were chosen systematically from an initial randomly -selected grid point. Stations were allocated equally between each of the two survey vessels within each stratum to allow a comparison of relative fishing efficiencies between vessels.
Stations were prioritized within each stratum to provide
three potential levels of systemically controlled sampling density. Station prioritization was necessary to accommodate the possible loss of survey days due to bad weather, mechanical breakdowns, etc. In 1990, each of the 754 selected stations was
assigned a priority based on the possibilities of completing either 450, 600 or 750 total successful stations. Priority One
stations were allocated from the minimum potential sampling level of 450 total stations and comprised 60% of the stations in each
stratum. Each stratum's remaining stations were divided equally between priority Two and priority Three sampling densities,
corresponding respectively to 600 or 750 total successful
stations. The priority One stations were always attempted.
Priority Two and Three stations were selected according to the prevailing rate of successful station sampling, amount of
available survey time and number of completed stations. If a
selected station was deemed untrawlable, a search for a suitable
alternate location would commence within 5 nmi of the original 10 station. If no trawlable location could be found after 20-30 minutes, the nearest station was selected from a list of alternates completed during previous triennial groundfish surveys. All stations were plotted onto large work charts for use aboard the survey vessels. Eastern Gulf of Alaska
In the eastern Gulf of Alaska, a total of 201 stations were planned for the survey. This number was based on the approximately 40 fishing days available for this area in 1990 and on an expected completion rate of five stations per day. The number of stations in each sampling stratum was based on a modified version of the allocation scheme used during the 1987 eastern GOA triennial survey (Sigler 1987) In 1987, an optimum allocation method for stratified sampling (Snedecor and Cochran
1967) was used to determine the number of stations in each stratum. This method computed optimum sampling densities for each stratum so as to minimize the expected variance of catch per unit of effort (CPUE) for sablefish (Anoplopoma fimbria) .
Sablefish was chosen as a critical species for the survey in the eastern GOA because it was the most valuable commercial groundfish in this area. In the computations, expected variances for sablefish were estimated from results of the 1984 eastern GOA triennial survey.
The 1990 modifications included: 1} reducing by 50% the station density in Yakutat INPFC area strata at depths from 101 to 200 m and 11
2) doubling the station density in all strata greater than 200 m. These changes were made so that more stations were located in deeper depths, where most of the commercially important species in the eastern GOA (especially rockfish and sablefish) are found.
The shallowest strata (1-100 m) were treated differently in the 1990 design. In the Southeastern INPFC area, no stations were allocated to this stratum because virtually the entire stratum was found to be untrawlable during the 1987 survey. In the Yakutat INPFC area from 1 to 100 m stratum (Yakutat
Shallows), only a minimal number of stations (n=6) were planned because the commercially important species of groundfish in the eastern GOA all reside in depths greater than 100 m.
Stations in shelf and gully strata were randomly selected using the same 5 by 5 nmi grid technique as previously described for the 1990 western and central GOA survey. A slightly different approach was necessary to select stations in slope strata. The grid method was not used because these strata are relatively small in size and are extremely narrow and elongate in shape. Instead, for each slope stratum, transect lines were drawn such that the area between transect lines was 25 nmi2•
Thus, the slope strata were composed of a number of irregularly shaped segments analogous to the grid squares on the shelf and gullies. The slope stations were then selected randomly from these segments. For each of the 201 randomly located stations, an alternative, non-random station in the same stratum was also 12 determined. These alternative stations were used as "backup" stations in case the original planned station proved to be untrawlable. The alternative stations were selected from successful trawl hauls made during 10 previous AFSC survey cruises in the eastern GOA from 1978 to 1987.
Overall Gulf of Alaska
The on-bottom trawling duration for each sample was scheduled for 30 minutes but was occasionally only 10 minutes, when trawlable bottom was less than approximately 1.5 nmi or when exceptionally large catches were expected. The on-bottom trawling time (duration) and vertical and horizontal openings were monitored with Scanmar net sonde units. To minimize potential fishing power differences between the survey vessels, standardized trawling and gear handling methods were practiced emphasizing the use of scope ratio tables (trawl warp relative to bottom depth) and maintaining a 3 nmi/hour trawling speed.
A successful trawl sample was one where horizontal and vertical net openings remained within the normal range, the roller gear consistently remained on bottom and only minimal trawl damage occurred through bottom contact. Unsatisfactory performance occurred when the sample result may have been affected by trawl damage, there was evidence of an unstable trawl configuration or if the net fished on the bottom less than 10 minutes duration. 13
Collection and Processing of Samples
Catches were emptied directly onto a sorting table (capacity approximately 1,100 kg), sorted to species and weighed. Larger catches were weighed with a dynamometer or estimated using a volumetric method and split into portions. A representative subsample was taken from larger catches that approximated the sampling table capacity and weighed. The subsample was obtained by positioning the codend opening so that one side of the codend emptied onto a sampling net positioned within the catch bin.
Obtaining a representative sample from both the top and bottom of the codend reduced sampling bias caused by species and size stratification within the codend.
The entire catch was sampled for Pacific halibut
(Hippoqlossus stenolepis), crab and major groundfish species that occurred in limited numbers. All other fish and large invertebrate species were completely sorted, counted and weighed, whenever possible.
Length measurements were taken for major fish species randomly by sex when numbers exceeded 10 individuals. The measurements were taken from the tip of the snout to the terminus of the middle caudal fin rays for all fish species. The exception was grenadiers, which were unsexed and measured from snout to anus.
Data collection primarily concentrated on 17 species of high commercial value or abundance in the survey area and included: 14
Arrowtooth flounder Atheresthes stomias
Pacific halibut Hippoqlossus stenolepis
Flathead sole Hippoqlossoides elassodon
Rock sole Pleuronectes bilineatus
Rex sole Errex zachirus
Dover sole Microstomus pacificus
Yellowfin sole Pleuronectes aspera
Wallfye pollock Theraqra chalcoqramma
Pacific cod Gadus macrocephalus
Sable fish Anoplopoma fimbria
Pacific ocean perch Sebastes alutus
Northern rockfish Sebastes polvspinis
Rougheye rockfish Sebastes aleutianus
Dusky rockfish Sebastes ciliatus
Sharpchin rockfish Sebastes zacentrus
Short raker rockfish Sebastes borealis
Shortspine thornyhead Sebastolobus alascanus
Age data were collected from these 17 species with principal emphasis on walleye pollock, Pacific ocean perch, Pacific cod, northern rockfish, rex sole, rock sole, arrowtooth flounder, 15
flathead sole, rougheye rockfish and Dover sole. To obtain an
age composition representative of the population, samples were
stratified by sex and length (i.e., centimeter size group) over a
broad geographical area. Weight observations were taken as part
of the age structure collection process and recorded to the
nearest gram.
Ancillary data were collected for several species by RACE
and ABL personnel or ·by personnel of participating research
groups. Pacific halibut sex composition and age structures,
blood samples for DNA composition studies and whole juvenile
specimens for parasite studies were collected by International
Pacific Halibut Commission researchers. Whole stomachs from
walleye pollock, arrowtooth flounder, Pacific halibut, sablefish
and six rockfish species were collected and preserved by
participants from the AFSC's Trophic Interactions Program.
Additional stomach content data were recorded from over 4,000
specimens of selected species to provide information on the
distribution and predators of juvenile pollock for the RACE
Division's Fisheries Oceanography Coordinated Investigations
Program. Skates (Family Rajidae) were collected and preserved
under an AFSC contract with Bucknell University in Lewisburg
Pennsylvania to elucidate species taxonomy. Selected specimens
were collected for the AFSC's Fishery Observer Program for
species identification training. Shortspine thornyhead whole
samples were taken for age structure evaluation studies by the
AFSC's Age and Growth Task. Squid specimens were collected for 16
the AFSC's National Marine Mammal Laboratory study relating squid beak size to body length. Additionally, marine mammal sighting data were recorded.
Data Analysis
The basic unit of sampling effort for each haul station was the bottom area swept by the trawl and was determined for each station using data collected by the trawl mensuration and ship's navigation systems. When the trawl mensuration system was unavailable or inoperative, the area swept was estimated from mensuration information collected from other stations.
Biomass estimates were calculated using the area-swept method (Alverson and Pereyra 1969). A detailed description of the analytical procedures is presented in Wakabayashi et al.
(1985). For each species, a catch per unit effort (CPUE) was calculated for each station by dividing catch weight by the area swept by the trawl. Mean catch rates for each species were calculated in weight (kg) and numbers per square kilometer
(km2)for each stratum sampled. Mean catch rates of combined strata were calculated as the component strata catch means weighted by strata area.
Biomass estimates were calculated by multiplying strata mean
CPUEs by strata areas and summing the results to obtain estimates by INPFC statistical areas and depth intervals. The 95% confidence interval was determined for each species biomass estimate. 17
Population length compositions were determined by expanding the length-frequency data to the total catch for each length and sex category at each station. The stratum population within a sex-length category was calculated by multiplying the stratum population by the proportion of fish in that category from the summed station data. Population size composition estimates were summed over strata to create estimates by area.
Age structures were interpreted by the AFSC's Age and Growth
Task using otolith surface ageing and the break-and-burn method
for pollock and the break-and-burn method for Pacific ocean perch. Age-length data were summarized to form an array of
frequencies at each age and length. The resulting age-length key was integrated with the length composition data to apportion the population among age groups by assigning the estimated number of
individuals within the population at each sex-length group to
corresponding age groups. Age composition was computed for each
stratum and summed by area and depth category.
Length-weight data collected from individual fish were used
to estimate length-weight relationships based on a non-linear
least squares regression algorithm. The length-weight
relationship was expressed as W=ALB where W=weight (grams),
L=length (mm), A=coefficient, and B=exponent.
19
RESULTS
From 4 June to 9 September 1990, 780 total standard survey trawl stations were attempted of which 708 were successful
(Fig. 2). The survey of the central and western Gulf of Alaska
(1700W long to 144°30'W long) was conducted between 1 June and
9 September 1990 aboard the chartered commercial trawlers
Pat San Marie and Green Hope. The Eastern Gulf of Alaska
(144°30'W long to 133°25'W long) survey was conducted between
14 July to 4 September aboard the NOAA research trawler
Miller Freeman. The total station sampling density averaged over two stations for every 1,000 km2 (Table 1). Sampling density was slightly higher in the eastern Gulf of Alaska than in the west.
The lowest sampling density occurred on the shelf in water depths shallower than 200 m, primarily due to the high proportion of untrawlable bottom. I'V Gulf of Alaska o
:= o It)o
Figure 2.--Successful stations sampled during the NMFS 1990 triennial Gulf of Alaska groundfish survey. allocationallocationallocationArea92094148Station16657715332successful4693.372.81372.13.21.7StationsStations125254579 911221528975 1-100 I-'Table 1. --Survey64,16344,362attempted(km2)(450)(600)(750)(station/14,5361,0002,5282,737tv area, km2) depth, area, stationdensity(m) allocations at three potential levels of sampling, sampling performance and sampling density Station Survey area Depth from the 1990 NMFS triennial ground fish trawl survey of the Gulf of Alaska by INPFC area and depth. Shumagin Sampling 201-300301-500101-2001-500
Chirikof 1-100 26,575 42 55 70 38 28 1.1
101-200 23,749 84 Il2 140 115 106 ' 4.5
201-300 11,501 II 14 18 17 16 1.4
301-500 1,633 2 3 4 5 4 2.5
1-500 63,458 139 184 232 175 154 2.4 2271668142successfulStations129516 tvTable 1. --(continued)97,52939,842attempted(km2)AreaallocationallocationallocationStations2.02033292.6743,1822862352152.2179139StationStation((station/11,5452,9601,0001.33.0 450)(600)(750)1691061147637956 5 km2) Survey area, depth,density1-100(m) area, station allocations at three potential levels of sampling, sampling performance and Survey area Depth Station sampling densitytv from'the 1990 NMFS triennial ground fish trawl survey of the Gulf of Alaska by INPFC area and depth. Kodiak Sampling 201-300301-500101-2001-500
Yakutat" 1-100 8,475 10 13 12 10 1.2
101-200 7,800 11 14 20 20 1.4
201-300 350 o o 3 2 5.7
301-500 542 o o 4 4 7.4
1-500 17,167 21 27 39 36 2.1
"The Yakutat INPFC area west of Cape S1. Elias (144°30'W long.) b The Yakutat INPFC area east of Cape St. Elias (l44°30'W long.)
C Not surveyed during 1990. Table 1. --(continued) Survey area, depth, area, station allocations at three potential levels of sampling, sampling performance and station density from the 1990 NMFS triennial groundfish trawl survey of the Gulf of Alaska over all areas by depth.
attempted127,616(km2)Areaallocation"~tation(203(750)(station/allocationallocationStationsStationssuccessful171 450)(600)Station186256320 1,000 1.4 densityI-woe(m) Sampling Survey area Depth Stationd km2) Total
101-200 120,472 288 370 447 384 360 3.0
201-300 35,692 99 109 119 126 117 3.3
301-500 12,969 61 64 69 67 60 4.6 tv If::>
1-500 296,749 634 799 955 780 708 2.4
d 1990 threshold totals include Auke Bay Laboratory planned stations.
e Does not include the Southeastern INPFC area, which was unsurveyed during 1990.
26
Water Temperature Distribution
Surface to bottom water temperature profiles were successfully taken at 298 standard trawl survey stations located east of the Shumagin Islands (Figs. 3 and 4). Three types of instruments were used to collect the water temperature profiles in combination or singly and included: expendable bathythermograph probes (XBTs), a conductivity and temperature device and a trawl-mounted Micro-BT. Temperature profile data were not collected west of the Shumagin Islands due to equipment failure.
Surface temperature data however were collected throughout the survey area using calibrated bucket thermometers. The total surface temperature data collected by both profile and bucket thermometers was from 531 stations.
Temperature sampling began in the Shumagin area on 4 June, approximately 40 days before the southeastern Gulf of Alaska sampling commenced, complicating area comparisons. Sampling progressed toward the central Gulf of Alaska from the Shumagin and Southeastern areas.
Surface temperatures were warmest (14-16°C) between Dixon
Entrance and Resurrection Bay (133°30'W long.-149°30'W long.) but decreased to II-14°C westward from Resurrection Bay to the Barren
Islands area and southwest through Shelikof Straits. Generally colder surface waters (8-11°C) extended up the gullies adjacent to Kodiak Island and the Shumagin Islands and nearby banks. West of the Shumagin Islands, surface temperatures decreased to 5-8°C 27
Surface to bottom sea temperature profiles indicated pronounced mixing of the water column within the general vicinity
of lower Cook Inlet, denoted by similar surface (II-14°C) and bottom water (9-12°C) temperatures. The coldest bottom
temperatures (3-5°C) occurred in the 101-200 m deep Shumagin
Gully northeast of the Shumagin Islands, the 201-300 m Shelikof
Strait gully and the 301-500 m gullies off Cape Spencer, Yakutat
Bay, and Cape Yakataga. <) 60° N
58°
"'0'
56° tv (XJ
SURFACE TEMPERATURES11145- -8~14 16 -,---r-155° 8 -11 --+ SYMB.OL •'"[2] 54°
Gulf of Alaska
1700W 165° 160° 150°
Figure 3.--Distribution of sea surface temperatures (Oe) observed during the NMFS 1990 Gulf of Alaska groundfish survey. ALASKA 60° N
58°
tv 56° \.D
Gulf of Alaska SURFACE8 11145 TEMPERATURES - -~14 16 135° 140° 8 -11 + BYMIillL L- I • '"~
54°
1500W 145° 132°
Figure 3.--(continued) Distribution of sea surface temperatures (OC) observed during the NMFS 1990 Gulf of Alaska groundfish survey. ALASKA 60° N 58° .", 560o W I 5 793BOTTOM- -12~ 9 TEMPERATURES150° 155°-,--~ 54° observed during the 5-- -+ 7 . SYMllQL (0 C) • ~A Gulf of Alaska 170° W 165° 160° Figure 4.--Distribution of bottom surface temperatures NMFS 1990 Gulf of Alaska groundfish survey. ALASKA 600 N 580 w ~ 560 79 - -12~ 9 GulfBOTTOM of Alaska TEMPERATURES35 - 7 5 I US/~\\f·~~54°I • + SYMBQL [2]••• 1500W 1450 1400 1350 1320 Figure 4.--(continued) Distribution of bottom surface temperatures (OC) observed during the NMFS 1990 Gulf of Alaska groundfish survey. 32 Overall Abundance and Distribution of Major Fish Groups The survey was designed to assess the demersal fisheries resource and does not provide adequate information on the distribution and abundance of invertebrates due to the catch inefficiency of roller gear on the trawl. Not sampled were species inhabiting depths above the range of the headrope and species residing in the relatively large untrawlable areas like Sandman Reefs northeast of Sanak Island and the Southeastern INPFC area's inner shelf in depths less than 100 m. The lack of sampling in depths over 500 m resulted in an inadequate assessment of groundfish species whose depth range extends into deeper waters. These deepwater species primarily include adult sablefish, shortspine thornyheads, Dover sole, and grenadiers. The 708 successful standard survey trawls completed in 1990 captured 124 fish species from 32 families (Appendix C as defined in Robins et al., 1991). The flatfish family Pleuronectidae was represented by 14 species and had the highest catch abundance, led by arrowtooth flounder (Table 2) at over twice the total CPUE (6,480 kg/km2) of any other species. The cod family Gadidae's three species were second in overall catch abundance dominated by walleye pollock (2,890 kg/km2) and Pacific cod (1,400 kg/km2) The rockfish family Scorpaenidae, dominated by Pacific ocean perch (470 kg/km2) and northern rockfish (380 kg/km2) represented the largest number of species, although 11 of the 25 rockfish species were unavailable west of the Kenai peninsula (152°W long.) area. The highest rockfish catch rates occurred 33 east of the Kenai Peninsula and consisted primarily of Pacific ocean perch. Sablefish was the only Anoplopomatidae family representative and had an overall catch rate of 712 kg/km2 and was most prominent in the central GOA. Skates species catches had a combined average of 160 kg/km2 overall and occurred predominately in depths shallower than 200 m. The 20 sculpin species (Cottidae) encountered during the survey were widely distributed on the continental shelf. The smaller sculpin species may have escaped through the net's comparatively large• sized mesh. The most abundant sculpins included the bigmouth sculpin (Hemitripterus bolini), great sculpin (Mvoxocephalus polvacanthocephalus) and yellow Irish lord (Hemilepidotus lordani). Highest catch rates of yellow Irish lord (190 kg/km2) and great sculpin (60 kg/km2) occurred in the Shumagin INPFC area's 1-100 m depth interval. Bigmouth sculpin was most abundant (230 kg/km2) in the Chirikof INPFC area's 201-300 m depth interval. Table 2. - - Mean CPUE (kg/km') for the 20 most abundant fish species by International North Pacific Fisheries Commission Area during the 1990 triennial Gulf of Alaska groundfish trawl survey. Shumagin Area Chirikof Area Kodiak Area Yakutat Area Southeastern Area Total areas Species CPUE Species CPUE Species CPUE Species CPUE Species CPUE Species CPUE Arrowtooth flounder 3,532 Arrowtooth flounder 13,176 Arrowtooth flounder 6,909 Arrowtooth flounder 2,556 Arrowtooth flounder 2,696 Arrowtooth flounder 6,477 Walleye pollock 2,587 Walleye pollock 3,030 Walleye pollock 4,502 Walleye pollock 863 Pacific ocean perch 2,629 Walleye pollock 2,888 Pacific Cod 2,084 Pacific cod 2,450 Flathead sole 1,162 Pacific ocean perch 662 Sharpchin rockfish 1,762 Pacific cod 1,395 Pacific halibut 1,301 Pacific halibut 1,482 Sablefish 1,333 Flathead sole 479 Redstripe rockfish 1,097 Pacific halibut 1,110 Rock sole 1,277 Flathead sole 861 Pacific halibut 1,258 Pacific halibut 449 Walleye pollock 745 Flathead sole 862 Flathead sole 965 Sablefish 784 Pacific cod 1,027 Dover sole 367 Pacific cod 579 Sable fish 712 Yellowfin sole 798 Rex sole 505 Northern rockfish 707 Sablefish 303 Sablefish 454 Rock sole 542 Northern rockfish 589 Dover sole 408 Rock sole 552 Pacific cod 269 Shortspine thornyhead 424 Pacific ocean perch 465 Atka mackerel 475 Rock sole 350 Dover sole 460 Rex sole 229 Pacific halibut 283 Northern rockfish 381 Pacific ocean perch 380 Pacific ocean perch 252 Rex sole 441 Big skate 210 Dover sole 277 Rex sole 328 Yellow Irish lord 149 Giant grenadier 179 Rougheye rockfish 265 Eulachon 117 Rex sole 194 Dover sole 327 W tl'> Sablefish 112 Rougheye rockfish 178 Pacific ocean perch 156 Dusky rockfish 108 Lingcod 159 Yellow fin sole 207 Rex sole 102 Pacific herring 142 Spiny dogfish 160 Silvergray rockfish 101 Harlequin rockfish 145 Rougheye rockfish 156 Giant grenadier 76 Eulachon 105 Dusky rockfish 172 Pacific herring 115 Yellowmouth rockfish 107 Sharpchin rockfish 125 Alaska plaice 48 Northern rockfish 92 Butter sole 136 Rougheye rockfish 106 Silvergray rockfish 452 Eulachon 92 Dusky rockfish 46 Salmon shark 83 Eulachon 129 Lingcod 99 Eulachon 85 Dusky rockfish 94 Great sculpin 44 Longnose skate 81 Harlequin rockfish 130 English sole 98 Spotted ratfish 71 Redstripe rockfish 77 Shortspine thorny head 27 Bigmouth sculpin 71 Skates unidentified 89 Shortraker rockfish 91 Redbanded rockfish 86 Giant grenadier 63 Dover sole 26 Shortspine thorny head 32 Shortspine thornyhead 39 Shortspine thornyhead 78 Rougheye rockfish 100 Shortspine thorny head 65 Rougheye rockfish 25 Shortraker rockfish 26 Shortraker rockfish 24 Sharpchin rockfish 47 Shortraker rockfish 89 Shortraker rockfish 36 Number of hauls 137 Number of hauls 154 Number of hauls 215 Number of hauls 134 Number of hauls 68 Number of hauls 708 35 Principal Fish Species Abundance, Distribution and Size Composition Results by individual species are tabulated by INPFC statistical area and depth interval. Charts of species catch density by individual survey station are included. The catch abundance categories by station for individual species are: 1) none, 2)CPUEs less than the mean, 3) CPUEs between the mean and two standard deviations and 4) CPUEs greater than two standard deviations above the mean. The proportion of the total catch of each species represented by the three categories are approximately 60% (category 2), 30% (category 3) and 10% (category 4). The length compositions are plotted by sex category, INPFC statistical area, and depth interval. Individual weight and length measurements were collected for 13 of the dominant fish species. The data were used to estimate the relationship of length and weight using a non-linear regression (Appendix D). Abundance estimates (CPUE and biomass) are presented by individual strata in Appendix E for the most dominant species and include the estimates of variance and confidence intervals. These precision estimates do not incorporate the variation associated with measurements of effort. CPUE is measured in kilograms per kilometer squared (kg/km2). Estimates are given for each stratum in which catch occurred. Catches are ranked in descending order. The strata are defined in Appendix B. 36 Arrowtooth flounder--With twice the abundance of any other species at nearly 2 million t, arrowtooth flounder (Table 3, Fig. 5) was dominant in the GOA, in every depth and all areas except the Southeastern INPFC area. The combined Chirikof and Kodiak INPFC areas had 79% of the total arrowtooth flounder biomass and less than 10% of the total biomass occurred east of the Kodiak INPFC area. Over all INPFC areas 84% of the arrowtooth flounder biomass occurred in depths less than 200 m. The highest catch rates of arrowtooth flounder occurred generally on the outer edge of the Chirikof and Albatross Banks, in surrounding gullies, and the Shumagin Gully. Arrowtooth flounder was widely distributed on the broad flats between Kodiak Island and the Kenai Peninsula. The arrowtooth flounder length composition over all areas and depths (Fig. 6) averaged 42 cm and ranged from approximately 18 to 81 cm. The length distribution was multimodal and dominated by the 38-50 cm group primarily from areas west of the Yakutat INPFC area. A second length mode ranged from approximately 30 to 35 cm and occurred primarily on the shallow « 100 m) inner shelf of the central and western GOA. The largest fish (50-55 cm) occurred in the deepest depths sampled (301-500 m) . 37 Table 3.-Total20,00111,694310,77612,414294,81613,176836,1202,353104,37511,1044,41643,5901,8412,69647,9583,42799,8273,0358,318120,9116,26972,3711,0915,3154403093672,556137,5574,444567,0676,909673,8783,532226,60444.052.38,736311,7941,922,11754.6(cm)41.541.341.98,6221,038,6516,477Mean37.435.839.341.839.938.135.7(kgIkm2)(kg)CPUE451140.9476355Biomass0.8120,9110.71.90.942.01.547.21.555.302,8804,605weightlengthhaulscatch1,0881,4881.651.8441,2041,411491053846479,508129139112354236631,004654230,023of198 number0.60.738.30.81.348.6171 5052.2 0.50.740.10.600.737.8281875620.80.943.02.155.60.6510.943.21.043.2 1.01.8Hauls1715with(t) trawl00 3601061291240.90.841.5 117215708154142 137119 134462323 252726572 2927 3635 601616 1817516 685656 4769 (m) of11-100 survey - 100 hauls, haulsMean containing arrowtooth flounder, estimated CPUE, biomass, mean weight and Area .All201301101101 Depth depths - -300500 200 All depths 101 - 200 Commissionmean statistical length areasbased and on the depth 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries Number ChirikofSoutheasternAllKodiakYakutatShumagin areas biomass, 95% confidence interval: 1,434,274 - 2,409,959 metric tons (t) All areas ALASKA <) 600 N 58° 'V W 560 00 540 snmo.L. CPUE (KG/Kt12) + NO CATCH • < 6.900 • 6.900 - 30.900 • 30.900 ). Gulf of Alaska 1550 1500 170° W 1650 1600 Figure 5.--Arrowtooth flounder catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (6,900 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° W \.D Gulf of Alaska 54° s...I.11aJ2.L.CPUE' (KG/KH2) NO CII rCH < 6.900 • 6.900 - 30.900 • 30.900 ). 1500W 145° 140° 135° 132° Figure 5.--continued. 40 SHUMAGIN CHIRIKOF KODIAK 1 5 FEMALES c::: UNSEXED Wf• 10 W 20 • YALES j (f)::< 10 15 : j _",- 8 20 It I ••• , , , • , •• , , •• , ,. , •• I , , • 1 , II•,• " " 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 1 ~ 1 ~ ~ :;j5 ~ 10 I I I 0 f-:r: 15 ~ 20 o 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 "" j ~:;: : j ~, ..•.. -- _.~. 1 ~. ~" o>- 5 Z 10 1 I J ~ ~ 15 8 20 "" , , , , , , , ::;: 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 f• Z Q.. 10 W ~ ::o5 J No data 1 No data 1 I nS ~ WI S'IFSI ffi~ 5 :~ J J ~ g 20 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 20 :t J ~ j •• - j ~ ~ 10 15 20 "" .. , , , "" .. , .. 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 10 20 30 40 50 60 70 60 LENGTH IN CM Figure 6.--Arrowtooth flounder length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. 41 YAKUTAT SOUTHEASTERN TOTAL UNSD:ED W 10 W 5 No doto ~ "O~..mt!II.. j •'-'''. ... J ~ g~ 5 10 15 20 oJ" •,, I • , I , , 1 •• , I " "'"" r r , ,, 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 20 :! 1 ~- 1 r ~ 1 -. 5 ! 10 I-:r: 15 I I a ~ 20 o 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 oZ -: w 15 a:: a:: W ~ 10 l- i:~ "1 ~ .~ ~~ '""1 ~ ~YW' ;" >- 5 U 10 W~ 2015 ~ ~ J J ~ ~ 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 I• Z W a:: Q.. 10 ~ ~ ::: 1 .'. "~.I1t~~ ~,r 1 I11lWlll!lll!i I i1 .••••,11.~I"'" "; 5 1 0 15 ~ ~ g 20 I ~ 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 20 :j j ~- j - ~ 1 --- 10 !~ 15 20 -" , , , , , , , , , , , " """"""""", , """"" , 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 LENGTH IN CM Figure 6.--continued. 42 Pacific halibut--The highest abundance of Pacific halibut generally occurred in waters shallower than 200 m west of the Kenai Peninsula (Table 4, Fig. 7). Halibut was not found deeper than 300 m, except in the Yakutat and Southeastern deep gullies and slope strata at low abundance levels. Halibut size increased and abundance decreased with increasing depth in every area. The highest halibut catch rates occurred in the shallow «100 m) Semidi Bank (4,500 kg/km2), Albatross Banks (3,200 kg/km2), Lower Alaska Peninsula (2,800 kg/km2), Portlock Flats (2,300 kg/km2) and exceeded 1,000 kg/km2 on most banks west of Kodiak Island. Halibut was the longest of any measured species and averaged 63 cm. The catch of large halibut (over 50 cm in length) increased from west to east, with the largest fish averaging 10 kg and 85 cm in the Southeastern INPFC area (Fig. 8). 21.82,26260,1241,63965,3131,12226,6511,10347,6421,20817,5621,48165,700376106,7211961171,244121,322(cm)1,592203,2041,48294,0211,30183,46478.1100.4Mean65.280.41,105328,027725717(kgIkm2)283122.2(kg)39383CPUE15.37424,17710.012,06811,15093.391.817,59693.688.8Biomass12.29.984.09.47,24703,7168,3688865,042weightlengthhauls4327813011500047573350of15450614.2101.3166.071.220210.14.163.66.072.74.764.83.559.03.356.43.960.67.29.383.82.954.55.067.5catch9917115560449969630 379115.4 5 98810.292.3338805.07.678.1 28254.462.475513.457.9 Hauls1714(t) trawlwith036012910621511736493 7081541371344640 5623253571698.485.1 29606 368162 271618684760 92 (m) '12 1-1001 - 100 Mean 43 Area All201301101201101All301Depth depths -depths - - 200500300 200300 500 All101 depths - 200 statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission - All depths All areas Number AllKodiakChirikofYakutatSoutheasternShumagin areas biomass, 95 % confidence interval: 274,566 -Table 381,488 4.--Total metric number tons (t) of survey hauls, hauls containing Pacific halibut, estimated CPUE, biomass, mean weight and mean ALASKA 60° N ~~ 58° "V ,p. 56° ,p. 54° nt:18.Q.L. CPUE: (KG/KH2) + NO CATCH • ( 1.000 • 1.000 - 4.200 • -4.200 ,. Gulf of Alaska 170° W 165° 160° 155° 150° Figure 7.--Pacific halibut catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (1,000 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 56° 56° of::> lJ1 Gulf of Alaska 54° .s.r.tm.IlL.. CPUE IKG/KH2) + NO CATCH • < 1.000 • 1.000--4.200 • 4.200 » 1500W 145° 140° 135° 132° Figure 7.--continued. 46 SHUMAGIN CHIRIKOF KODIAK 10 (I) FEMALES Q:: Vi ¥ALESUNSEXED f•W W :;:, o 5 o " :::; WALES'_._1111"--.JI I I •.I J 0I I _. I...I' 1111II'0w II I 0:: W0:: w0:: FrMAlES u- w 1151151501151501854510I4580115458011515045801151501851858015018515015018510458011515018580115 10II10 104580 1045 \I 115(f) .J~.J ;;~0~~ (f) 1 TOTAL 0 f-(f)Nw0:: W0::f-<1: ., w UNSEXEDonf-Q.W<1: I 1005IIII 10IIIIIII III SOUTHEASTERN1 n Q.~z 0 . 0 U<1: 0z-uZ:::;Nf-::JW-'0::w<1:Q.I:::; I .01111111111II. J.lmIU~hI 11I1II 45IIHI.I I (f) 47 f-I>-a 5f- ~ No doto n-'I 10 II I"~,,I 5 ~ 10•• I IIIIII 11. II I 1II 10 I ~IIIIII~U"I ..I. II I I I(f) u I I 10 0 LENGTH IN CM IIIIIII~I~~~I I 10 1 I 0 II" YAKUTAT ;; • Figure 8.--continued. 48 Flathead sole--Flathead sole abundance totaled 255,700 t and was distributed primarily (90%) west of Montague Island in depths shallower than 200 m (Table 5j Fig. 9). Areas of highest flathead abundance were the Kodiak INPFC area's Albatross Shallows (8,900 kg/km2j 54,600 t), Chirikof Bank (2,000 kg/km2j 22,300 t) and the Lower Alaska peninsula (4,100 kg/km2j 30,500 t). Abundance averaged approximately 7,000 t in the gullies and shelf areas adjacent to the Albatross Banks. Flathead sole ranged in length from approximately 9 to 47 cm (Fig. 10). The largest fish occurred primarily in shallow depths « 100 m) in the Kodiak INPFC area and in depths over 200 m in the Chirikof and Yakutat INPFC areas. 0.10.30.50.21,17731,2881,87974,8501,330169,7181,123255,7141,162113,315(em)31.832.431.333.434.830.930.633.3Mean31.2(kg/km2)(kg)37254,661479231421140.5773CPUE76,17734,95525,76082630461,93813,76310,8411012,00618,368Biomass0.48090.30.40.330.733407330.2 2403,5069,7865,005haulsweightlength1,1262301043811786120~9,8173951243532of0.432.10.331.10.329.50.30.332.20.330.90.30.40.331.20.431.876965catch96171883297 00.432.00.432.90.328177551261714817 Haulswith(t)0 trawl36026463212910611763274 708426862 21515113477 15413746562321 60273 252 2936180 16685 61250.1 4000 79 (m)1-1001 - - 100 Mean 49 Area 301201101Depth - - 500300200 300 All201301 depths - 500300All101 depths - 200 statistical areaslength and based depth on intervals.the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission All depths All depths Number AllKodiakYakutatSoutheasternChirikofShumagin areas biomass, 95% confidence interval: 192,209 -Table 319,220 5.--Total metric number tons (t) of survey hauls, hauls containing flathead sole, estimated CPUE, biomass, mean weight and mean All areas ALASKA <) 60° N 58° ~ V1 56° a 54° snmm.. crUE (KG/Kt12) + NO CATCH c BOO • 800 - 5.400 Gulf of Alaska • 5.400 > 1700W 165° 160° 155° 150° Figure 9.--Flathead sole catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (800 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 600 N 580 560 lJ1 f-' Gulf of Alaska 540 s..um.o.L.. CPUE !KC/KI'12) + NO CATCH • « 800 • 800 - 5.-400 • 5.400 » 1500 W 1450 1400 1350 1320 Figure 9.--continued. f- w f'1 1J wf-(f) 0 5 0::::::; 00 - f-0« 0::N0w w0:: l.L W I 101525354550253545••.•.lES9• .alW!WWlli!lUh..~~IGiIlUUUUH!Ual;m~. 515253545515 nil::::;1n ~I . 0SOUTHEASTERNTOTAL(f) INo dataNodata f-::::;::::; No data (f) 0f'1 f- Z -'0::wIf)f-Wa.::>FEMALES 105 5 53 0::W -I No data I No data U 0:r:a.Z 3:a.Z« 5 -I 10 NoUNSOCEO data « 0«ZNU I I (f) a:r:>- 05 f-0 -'I 5 I f- 0 I 10 , 0 5 J - :r: 10 LENGTH IN CM -~ j- 5 105 J ~ 10 YAKUTAT 1 ~ j : 1] ~-- 1j 1 1 ,. Figure lO.--continued. 54 Rock sole--The rock sole total biomass of 160,700 t (Table 6) was concentrated (80%) in depths under 100 m from the Fox Islands (18,500 t) eastward to the Albatross Banks (34,800 t), with catch rates exceeding 1,000 kgjkm2 throughout most of these areas (Fig. 11). In waters deeper than 100 m, half of the available rock sole biomass of 16,800 t occurred on the Shumagin outer shelf. The total rock sole length composition (Fig. 12) had a bimodal distribution ranging between 17-34 cm and 35-47 cm. The Chirikof INPFC area had the lowest proportion of 17-34 cm rock sole. Over the survey area, rock sole averaged 32 cm in length. 1,64172,7861,235160,687(cm)1,27781,9251,127143,82734.4Mean32.332.534.534.032.4(kgIkm2)(kg)22,196CPUE4935073553,8125522,62416,767107103020.919,52610913Biomass74,6192,5922,3220.60.534.01290.79,1250.533.103930.4 7139541haulsweightlength4600049,19410620248140of1290.7105790.4 0.60.50.431.50.60.50.431.4catch54331711079230 0.50.532.275702851Hauls174138 3(t) trawlwith03601291061172157081541371347 4634628 2356250 29270 360 6016180 68400 925140.4 76 (m)11-100 - 100 Mean 55 Area 201101Depth - - 200300 200 301201 - - 500300 300All301101 depths - 500200 statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission Number SoutheasternAllKodiakChirikofYakutatShumagin areas biomass, 95% confidence interval: 119,787 - 201,587 metric tons (t) All areas Table 6.--Total number of survey hauls, hauls containing rock sole, estimated CPUE, biomass, mean weight and mean ALASKA <) ., 60° N 58° ~ lJ1 56° m 54° SIJ1I.iCl.. CPUE (KG/KH2) + NO CATCH '" 400 • 400 - 2.500 Gulf of Alaska • 2.500 Jo 1700W 165° 160° 155° 150° Figure 11.--Rock sole catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (400 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° lJ1 ...J Gulf of Alaska 54° S1lmDL. CPUF fKG/KH2, + NO CATCH • « 400 • 400 - 2.500 • 2.500 ,. 1500W 145° 140° 135° 132° Figure 11. --continued. 10 ~ ::;: wIa: w L.- WALES 15 ::;: 1IJ No data a:I- I- -'c.; NI-wa: w FEMALES w 20253035202520253035404550403045502530353540455015105 15 40::;: No data 0SOUTHEASTERNTOTAL1IJ No dataNodata~~ data 1IJ::;: 1IJ 0I 01IJr') wI-a:Z Figure 12.--continued. 60 Rex sole--Rex sole catch rates exceeded 1,000 kg/km2 in the Albatross Gullies, Portlock Flats and Lower Shelikof Gully (Fig. 13). Rex sole abundance over all areas and depths totaled 97,300 t (Table 7), of which 80% occurred in the Kodiak and Chirikof INPFC area's 101-200 m and 201-300 m depth intervals. The largest rex sole occurred on the Chirikof Bank averaging 42 cm and 0.6 kg. The total Kodiak INPFC area rex sole length distributions were normally distributed (Fig. 14) from approximately 20 cm to 50 cm. The length distribution of Shumagin INPFC area rex sole formed approximately 2 modes 30-50 cm and a narrow 26-29 cm mode. The Southeastern INPFC area's length distribution had a very low proportion under 30 cm in length. Over 50% of the Yakutat INPFC area's rex sole were 32-37 cm in length. 1,09512,596(cm)0.233.934.436.5Mean31.836.932.537.236.837.5(kg)251CPUEBiomass43222697,31721,2412118115,030812400.337.659,91732,04433,56843,0101708310.231.71,12912,3051,30214,482(kgIkm2)0.30.438.10.231.60.434.54,8144,2200.232.4677774410.538.53,4430.231.96,5160.4290.641.84,9820.335.24,6950.231.04970.335.51,6333,6546,581hauls-catchweightlength1,50851,324000104595252297109229122791426108591943233ofII1540.30.20.540.10.540.21990.2 0.540.30.40.437.18961017163118486520.437.075285115106Hauls17with(t)0 trawl360106129117708505328 21513413767102 154116505 462320165 5647 2518 604187 2725263 29361814169 166842931520.3 7697551 (m)I1-1001 - - 100 Mean 61 All areas biomass, 95 % confidence interval: 76,686 - 117,948 metric tons (t) Area All201301101301Depth depths - - 200300500 500300 All depths 101 - 200 statistical areasbased and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission All depths-- Number SoutheasternYakutatKodiakChirikofShumagin All areas Table 7.--Total number of survey hauls, hauls containing rex sole, estimated CPUE, biomass, mean weight and mean length 580 .". 0'\ rv 560 54° .s.I11DJlL.. CPUE (KG/KI13.L NO CATCH c 400 • -400 - 2.000 Gulf of Alaska • 2.000 > 1700W 1650 1600 1550 1500 Figure 13.--Rex sole catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (400 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. IIIII ALASKA 60° N 58° 56° CJ'\ W Gulf of Alaska 54° .s.ll1Wl.L.. CPUF (I(C/Kt121 NO CAtCH < 400 • 400 - 2.000 • 2.000 » 1500W 145° 140° 135° 132° Figure 13.--continued. :::>' a wQ::<{ I...- " 1520203020304050504030304050405010 U1 wI w U1 11 UNSEXED:::>':::>' ,. a >--0 r<):::>' wQ::[L>--=> 105 F'EMAl(S w >-- 15 ;; aU1-CHIRIKOFKODIAK Q::W a<{w NawQ::>-- ZI 05 " No data U<{ uaZ0wN<{[LQ::ll)>----1 15 NMFS10and1990Gulfthe14.--RexsoleInternationalstatisticalarea~ w>-- I3: 5 0 10 .r<)--1>-- 10AlaskalengthcompositionFisheriesCommission -groundfishduringNorthsurveyii by 64 >- 15 .• aI 10 i r 10 of 15 Pacific 101510 1 1 1 • "ALES 15 depth. LENGTH IN CM .1. Figure SHUMAGIN ~ fi~ n~ 10 1 ~ -~ ~ ': j n~J jj ': j j j 1 I 1 10-: >- a:: w a:: N u.. 2030405020.50405020.504020WALES20305504040500 10 g wf- 0 (f1(f1 ::::;: w :r: IC; a::::::;: >-a::wa..W a" • FE,WA.LES w 152030402030503040 10 10 0 0SOUTHEASTERNTOTAL(f1 0::::;: 0a::nf- :~ j • Figure 14.--continued. 66 Dover sole--Approximately 50% of the total Dover sole biomass of 97,100 t was found in the Kodiak INPFC area (Table 8). The remaining biomass was primarily divided between the Chirikof and Yakutat INPFC areas. Dover sole shared some of the same high abundance areas as rex sole, including the 101-200 m shelf and gully areas adjacent to Kodiak Island (Fig. 15). Dover sole were more abundant than rex sole on the shallow (1-100 m) bank surrounding Chirikof Island and less abundant in adjacent deeper waters than rex sole. Dover sole ranged in length from approximately 25 to 57 cm and averaged 42 cm overall. The Chirikof INPFC area had the highest proportion of large Dover sole averaging 45 cm overall (Fig. 16). Female abundance approximated that of males in all areas except the Southeastern INPFC area (approximately 20% female). Small (30 cm) Dover sole had low abundance in all areas. 4813560.645.512,4690.432.9(cm)44.542.742.443.8Mean(kg/km2)(kg)654CPUE40970622125,89136,89839758,16744,89497,08119,73010,5871,6461,98819,72114,354Biomass0.842.40.90.840.80.741.9460854500.943.7All0.840.70.536.10.841.30.637.70.841.10.842.39,4494,5836,7254,9202,0912,4425,2421.347.32,0581,886haulscatchweightlength1,42543756120.943.414921618612770026230.8of131470.841.60.741.10.741.08440.80.842.51.0721.044.71713598995539028753418851Hauls(t)171050 0 depthstrawlwith360255483106129105117215708445327 15499408 1372726 134111367 4615486980.9 2317999760.5 5646493 2923 6056519 273632501 251618684752817110.740.9 69418500.7 (m)·111-100 - - 100 Mean 67 Ail areas biomass, 95 % confidence interval: 72,543 - 121,620 metric tons (t) Area": All301201101Depth depths - - 500200300 301201101 - 200500300 101 - 200 stlltistical areaslength and based depth on intervals.the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission -- Number SoutheasternChirikofKodiakYakutlltShumagin All areas Table 8.--Totlll number of survey hauls, hauls contllining Dover sole, estimated CPUE, biomass, mean weight and mean ALASKA <) 60° N 58° "0' m 56° CD 54° S111IlQL. tPUE (KG/Kt12) NO CATCH 1700W 165° 160° 155° 150° Figure 15.--Dover sole catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean, 3) between the mean (400 kg/km2) and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 600 N 580 560 0"\ \D Gulf of Alaska 540 S1t1B!lL. CPtJF (I(G/Kt12) NO CATCH c 400 • 400 • 1.900 • 1.900 :> ,- -1--' 1-----1 l---'--T- -r- T I 1500W 1450 1400 1350 1320 Figure 15.--continued. 70 SHUMAGIN CHIRIKOF KODIAK fEMAlES a::: 5 No data ::• 0••••• ~ o 1 n ~nIn JIill1fm. r.fj~ u ~90 "j5 •"'. 10 15 20 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 ":~ 1 1 ~ j. ~ ~; 5 i~Mv , 10 I "I I 0 I-:r: 15 ~ 20 o ": 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 Z 4 20 0::~ 0::w 15 I-w 4 10 ~ 2S 5 No doto 0 :r: 0 = 0 n >-;;: 5 I U 10 a ~Z 15 N 8 20 E 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 I- 1 -~. j ~i • 1 ~ ~ ~ :i5 1015 ill I U I n0 20 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 20 :f 1 -~. 1 ~ 1 ~ ~ 10 15 20 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 LENGTH IN CM Figure 16.--Dover sole length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. 71 YAKUTAT SOUTHEASTERN TOTAL 20 15 FEMALES a:: • UNSEX(DMALES wV1 10 W 5 No data ::; o a 5 10 15 20 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 j 'o'mo j ~ : :ij5 ~ 10 t-:r: 15 I I I a ~ 20 o 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 oZ ~ w i':; :: j ~j •. J AL. ~ r 5 u 10 ~ 15 J J J ~ 8 20 E 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 t• Z w~ 15 w~ ~ '"1': ~ 1 o~ 1. ~ ~ 5 10 15 i i i g 20 20 30 40 50 60 20 30 40 50 60 20 30 40 50 60 20 1 ~ ~ 10:tj ~ j ~ LENGTH IN CM Figure 16.--continued. 72 Yellowfin sole--Yellowfin sole had the most limited distribution of the principal flatfish (Fig. 17, Table 9) with 75% of the total biomass (61,800 t) occurring on the shallow (1-100 m) Alaska peninsula shelf in the Shumagin INPFC area. Other high abundance areas were the Upper Alaska Peninsula (1,700 t), adjacent lower Cook Inlet (5,300 t), Davidson Bank (2,600 t), Shumagin Bank (2,200 t) and Chirikof Bank (1,700 t). The only occurrence in waters deeper than 100 m was in the Shumagin Gully (900t). The yellowfin sole had a narrow length distribution (Fig. 18). Approximately 70% of the Shumagin INPFC area's yellowfin sole ranged between 29 and 36 cm. Small yellowfin sole (under 29 cm) comprised approximately 50% of the total for the Chirikof and Kodiak INPFC areas. 1,13750,4260.736.7177(em)26.5Mean(kg/km2)798(kg)537640.736.6723,53651,19060,8847,04561,771Biomass8887,0450.33,4120.326.370.328.451240.736.90haulsweightlength0000of120.430.70.430.80.431.7017128477catch11561503 0288128 755183Hauls170withCPUE8(t)0 trawl3606106129000 1170 21570834208 1541371344656230 2960250 36270 1618680 4697000 (m)1-1001 - - 100 Mean 73 Area-: 201101Depth - 200300 All201301101 depths - 500300200 Kodiakstatistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission All depths Number ChirikofAllYakutatShumagin areas biomass, 95 %Southeasternconfidence interval: 1,510 - 122,033Table 9.--Total metric tons number (t) of survey hauls, hauls containing yellowfin sole, estimated CPUE, biomass, mean weight and mean All areas ALASKA <) .! 60° N 58° ..". -..J 56° ~ 54° S1t1a..O.t.. CPUE (KG/K",2) + NO CATCH < 100 • 100 - 2.700 2.700 • Gulf of Alaska • 170° W 165° 160° 155° 150° Figure 17.--Yellowfin sole catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (100 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. 75 '"00~() IU") •;:j~ty)H ..-j.--i ..-jIi..wI(l) 0 r-- ;: (l) 76 SHUMAGIN CHIRIKOF KODIAK "J"~"~ ""'"WALES""." 1 ~ ~§ 5 Ii 10 15 20 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 o ~ ~1iJ 1 '0 'mo ~ :!5 j j 10 ~ f-:r: 15 I ~ UP I ff' m I 0 8J 20 o 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 zo -; a:: w ~ 10 f- ; :: 1 No data 1 No data 1 No data ~; i>- 5 ~ U 10 ~ 15 J J J ~ 8 20 ~ 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 f• Z wa:: 15 wa:: CL 10 f- ~ No data 1 No data 1 No data ;" ~ "j5 :: 1 1 1 g 20 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 20 :tj -~ ~ 1 ~ 10 ! 15 20 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 LENGTH IN CM Figure 18.--Yellowfin sole length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. 77 YAKUTAT SOUTHEASTERN TOTAL 1 5 . FE.ALES ~ VNSEXEO W '"1': 'o,~o •~~'o,~o j ~ ~ 5 10 15 20 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 20 :~j '0 ,~O 1 '0 ,~O 1 ~ ~ 5 10 f-I 15 I I I E3 ~ a ~ 20 o 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 zo w 15 Q: Q: W ~ 10 f- :~ '"j : No data j No data j No data ~; >- 5 u 10 ~ 15 J J J ~ 8 20 Q: u... 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 f• Z W Q: CL 10 ~ ~ :::. j No data 1 No data 1 No data ~; 5 :~ ~ ~ ~ g 20 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 20 :! j '0 '0'0 j '0 ,~O j 10 -4. !~ 15 20 15 20 25 30 35 40 15 20 25 30 35 40 15 20 25 30 35 40 LENGTH IN CM Figure 18.--continued. 78 Walleye pollock--Walleye pollock was the second most abundant species (857,100 t) occurring over all GOA areas and depths (Table 10, Fig. 19). Pollock biomass was primarily concentrated on the shelf in the Kodiak (50%), Chirikof (20%) and Shumagin (20%) INPFC areas. The Kodiak INPFC area's pollock occurred principally in the 101-200 m deep Barnabus, Chiniak and Marmot Gullies (23,230 kg/km2;182,100 t), Albatross Banks (2,500 kg/km2; 38,700 t) and adjacent shallows (1-100 m depth; 6,400 kg/km2; 39,200 t). The primary Chirikof INPFC areas were the shallow (1-100 m) Chirikof Bank (5,700 kg/km2; 62,200 t) and off the upper Alaska peninsula (5,500 kg/km2; 45,700 t). Shumagin INPFC area pollock occurred primarily (80%) in the shallow (1-100 m) depths off the lower Alaska peninsula (7,900 kg/km2; 58,800 t) and on the Davidson Bank (4,300 kg/km2; 58,500 t). East of the Kenai Peninsula, pollock abundance declined to 46,500 t (900 kg/km2) in the Yakutat INPFC area and 13,300 t (700 kg/km2) in the Southeastern area. The pollock length distribution ranged from 8 to 67 cm and was comprised of three prominent modes (Fig. 20). The largest mode contained 40-60 cm fish while smaller groups of 20-30 cm and 5-10 cm were recorded throughout the survey area. 1,4852,69739,2012,33292,8972,765122,6741,9976,86979,3012,587165,9862,58061,2834,063107,9811,2586,1301,2452,645337,5354,502439,1133,327118,733(cm)0.846.452.23,030192,2806,166266,26747.92,88845.83,311398,93144.549.041.044.237.847.2Mean38.636.7length(kgIkm2)700(kg)358CPUE46,44725,27174527.13,98313,256Biomass0.9857,0810.90.51.00.745.51,88206,909weight haulscatch1.01,062435494932196471422,969419480.7 283412086354867of0.643.6170.117.90.948.50.946.00.846.10.60.633.20.224.70.4171122956,269 4,0630.8781.0 0.533.50.70.429.800.60.743.00.80.431.40.843.1282151370.947.5751715830 Hauls(t) trawlwith00 36029110678129109117107708215177154114 137134462316 56256029145 2723 2936184 16684129480.8 798 6 (m)1-1001I - 100 . Mean 79 Area All201301101101Depth depths - - 200 200500300 300 All depths 101 - 200 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries All depths Number AllKodiakSoutheasternYakutatChirikofShumagin areas biomass, 95% confidence interval: 666,395 -Table 1,047,768 IO.--Total metric number tons (t) of survey hauls, hauls containing walleye pollock, estimated CPUE, biomass, mean weight and All areas ALASKA <) ., 60° N 58° ~ 00 560 o 540 .s..xnBQ1.. _ CPUE (KG/KI12) NO CATCH « 3.200 • :" 200 - 20.000 • 20.000 » Gulf of Alaska 1700W 165° 1600 1550 1500 Figure 19.--Walleye pollock catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (3,200 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 560 CD f-' Gulf of Alaska 540 ntm.Q1.. CPUE (KG/Kf12) + NO CATCH • .( 3.200 • 3.200 - 20,000 • 20.000 > 1500W 145° 1400 135° 1320 Figure 19.--continued. 82 SHUMAGIN CHIRIKOF KODIAK '; - -"" e o ~ ~ ~a ~" ~ "15 =~~" ~ ~ 10 15 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 V1 "'; 1 •.. 1 - •. -. 1 - .. 5 +- ~ I-I 10~ ~ ~ a ~ 15 C) 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 5 IS 25 35 45 55 65 75 ZC) w a: a: 10 w ~: "1 o~" 1 _.~~~ g~ U>- 5 ~ 10 ~ ~ ~ ~ 8 15 E 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 I• Z w 15 a:U V1a: w 10 w a.. wI- 5 No doto No doto a~ o a L{") 5 I 10 g 15 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 15 '~j · .~ 10 r .. .- ~ 15 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 5 15 25 35 45 55 65 75 LENGTH IN CM Figure 20.--Walleye pollock length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. 10": UNSEXED I...JIY t.... 15253545551525354555657575455565754555657515105YAlES 515253545556575515 51525354555 W (f) ::::;::::; D- W II I-::::;IYw wIYWD-:::> FEMA.LE:S w 253545253565556515 55 0 0SOUTHEASTERNTOTAL NoIY(f)W data 0 0::::;;;w nNI-(f)IY <1:l- 1005 ZNI-wIY<1:D-W~ 15 5 83 wIYZ 50 ..•.. UZ<1:U a0wIf) • ~~ (f) ~ 0 Z I-...J 10 ~ I-I>- 10155 0n 5 ~ ~~ 1010 10151510 I 15 15 •• 15 LENGTH IN CM .~- ~ YAKUTAT . j j :! j ~. P1 Figure 20.--continued. 84 Pacific cod--Pacific cod was most abundant on the shelf in areas west of Cape St. Elias and in depths shallower than 200 m (Table 11; Fig. 21). Cod catch rates exceeded 5,000 kg/km2 in the Semidi Bank and Lower Alaska peninsula areas and exceeded 2,000 kg/km2 in the Davidson Bank, Fox Islands, Albatross Shallows, and Chirikof Bank areas. Over 90% of the total GOA Pacific cod biomass (414,100 t) occurred in depths less than 200 m. The principal shallow areas (1-100 m) included the Semidi Bank (48,300 t), Davidson Bank (40,100 t), Lower Alaska peninsula (37,400 t), Chirikof Bank (27,000 t), Albatross Banks (22,100 t) and Fox Islands (20,600 t). Pacific cod had the broadest length range (5-95 cm; Fig. 22) of any roundfish taken during the survey and averaged 52 cm overall. The Kodiak INPFC area's length distribution was dominated by four prominent length modes (10 cm, 25 cm, 45 cm, and 62 cm). Small cod, under 40 cm in length, were most abundant in the Kodiak INPFC area and least abundant in the Chirikof INPFC area. The largest cod, averaging 2.9 kg, occurred in the 201- 300 m depth interval primarily in the lower Shelikof Gully (11,400 t), Prince of Wales shelf (4,700 t) and slope (3,000 t) and Kenai Gullies (2,400 t). 1,1692,70564,2502,360104,7092,92677,7621,93028,0541,04841,7673422,45052.92,084133,71548.1(cm)1,027100,1211,822232,4891,24052.363.656.9Mean56.862.11,395414,0721,318158,784(kgIkm2)701(kg)22,755CPUE492381.92692066661010,30314,482Biomass155,4522.52.962.53.063.804,7893,3526,9211.855.25,9938,2511.7haulsweightlength508298130132042III53353,5652.013,440of1917016161.8 2.151.23.063.92.92.257.72.22.558.6catch1711446263831.136.6931.6556291.7 02.357.5 02.656.19372.265.22.655.42.01.955.3 5141756328241.644.9 1.848.8 Hauls1716490 (t) trawlwith00 360129106117708215137154134462356256043441.7 2918415 273618166842579 600 794000 (m)1-1001 - 100 Mean 85 -: Area 301301201101Depth - - 500200300 All301 depths - 500 All101 depths - 200 Kodiak statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission Number AllChirikofSoutheasternYakutatShumagin areas biomass, 95% confidence interval: 289,070 -Table 539,074 11.--Total metric tons number (t) of survey hauls, hauls containing Pacific cod, estimated CPUE, biomass, mean weight and mean All areas <) 60° N 58° v 56° CD (J) 54° .s.nmD.L. CPUF (I(C/KH2) NO CATCH c I.JOO • I.JOO - 5.600 Gulf of Alaska • 5.600 ,. 170° W 165° 160° 155° 150° Figure 21.--Pacific cod catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (1,300 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° (X) -..] Gulf of Alaska 54° Sl1:18.Q.L. CPUE (t(C/Kt12) NO CATCH • 5.600 )0 1500W 145° 140° 135° 1320 Figure 21.--continued. -: a W::;; Q:: (; LL ::;; I- II I-a 0 ::;; a I- (f)Q::WI w0..Q:: w _•25254565851055254565851055251025456585105525456585105525456585105254510550~lililin .JW1o!~45i85105545658510552545658510545656585105525456585658510565"~IIIIJ~BIIIIJI!!IIIIJ'_WALES ~(lII:IIDIIIU"'N\-.•! .~~. I-1 I No dataI .1--~ (f)(f)SOUTHEASTERNTOTALNo-1 dataNodata a a aI")Q::I-W I-~ IJII ZW ~Q::0..FEW...J ••••• LES 105 5 ;;N WwQ:: Sablefish--An estimated 85% of the total sablefish2 biomass (211,300 t) occurred in the Kodiak and Chirikof INPFC areas (Table 12; Fig. 23). The highest catch densities occurred off the Kenai peninsula in depths of 101-200 m (5,600 kg/km2) and 201-300 m (8,000 kg/km2). Catch rates exceeded 3,000 kg/km2 in the lower Shelikof Gully (201-300 m depth) and surpassed 2,000 kg/km2 in the deep gullies (301-500 m) of the Yakutat and Southeastern INPFC areas. The catch was low in the Shumagin INPFC area and limited primarily to the Shumagin Outer Shelf (760 kg/km2 CPUE) Sablefish were approximately 50% heavier in the central GOA (average 3 kg) than in the western and eastern GOA (average 2 kg) . The highest proportion of small sablefish occurred in the Yakutat INPFC area (Fig. 24), where half the population was less than 54 cm in length. Small (54 cm) sablefish represented less than 10% of the population in the central GOA Chirikof and Kodiak INPFC areas. An intermediate number of small sablefish occurred in the Southeastern INPFC area, which had a prominent 9-17 cm length mode. Over all areas, the majority of sablefish averaged between 60 and 75 cm. 2 This species was not adequately assessed becaus"e a large proportion of the population is distributed in depths deeper than 500 m. Refer to the section entitled Overall Abundance and Distribution of Major Fish Groups. 0.13,27337,6392,72697,2871,4364,1414,80655,488<1,6925,0151,60069,08120221182411053.9(em)1,333130,04266.264.262.365.462.4Mean58.9285224length(kgIkm2)(kg)5093032596,733454443CPUE5,04749,73911116,28112,23310,516Biomass3.6403.165.52.155.14,3817,1542.356.62.862.71.931.42.48037122.057.12.22.257.82,8142,479018,3621.450.58,0841.757.15,9601.81,1281,0921,345weighthauls4943943232369030232536402.863.8of194260.71912.763.12.359.12.560.22.863.31.753.93.33.366.33.566.33.1catch9217145 ,2991619803.0 5532.065.728492391.0 512.8751176Hauls(t)0 trawlwith3601299010611792 215123708345 13415465784 137466410 2314 5636287 2520 2736602911816 1614 6846796 (m)11-100I - - 100 Mean 91 Area All201301101Depth depths - 500300200 101101 - - 200 200 101 - 200 statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission All depths Number AllSoutheasternKodiakYakutatChirikofShumagin areas biomass, 95% confidence interval: 138,401 - 284,198 metric tons (t) All areas Table 12.--Total number of survey hauls, hauls containing sablefish, estimated CPUE, biomass, mean weight and mean ALASKA <) 60° N 58° ~ 56° ~ tv 54° s.I.tlflD1.. CPUE (KG/1U12) + NO CATCH " 900 • 900 -" 7.700 Gulf of Alaska • 7.700 » 170° W 165° 160° 155° 150° Figure 23.--Sablefish catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (900 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 1.0 56° W Gulf of Alaska 54° .s.nmo.L. CPUE (t(G/KH2) NO CATCH ( 900 • 900 - 7.700 • 7.700 ~ 1500W 1450 1400 1350 132° Figure 23.--continued. e:: .. 4085,, .. ., ,, to10,,,,, ,W,,.,I" , , , , UNS(X(De:::::; 0 0-:::;e:: Wc..=' u. FUIAL.ES W " 85252540557085254055701555708570105 .. 10254055 1025405570851025405570 0VI CHIRIKOFKODIAKNo doto W 0:::;;;WII Nr<)VIe::0- We::z«e::0- 1050 No data 10 UU 0«ZIf)Ne::0-Wc....J 15IAlaskaNMFS101990~ ~ III j 0 VI 94 ~VI I~ 105 0 10. « 0r<)0-..J 10depth. ~ ofPacificFisheriesCommissionbyInternationalcompositionduringthegroundfish24.--Sablefishstatisticalsurvey1areaslength :>- 1015 -0 10 10 and Gulf 1510I MALES 15 North LENGTH IN CMSHUMAGIN Ii ~4 Figure :i 15 J Al -4- ': j t 11 : j 4r 1 D::: 10 :::;; D::: D::: LL w 2540557085104085251555705570854055705WALES2540557085101025 1025405570 102540557085 f- (/) No data :::;; 0 :::;;aW0I r<)f- a.WD:::::>w rEYA.lES w W 150 aSOUTHEASTERNTOTAL (/) a0W Naf-(/)D::: D:::ZWf- 50 - UU ZUNS[XEDa.«IN0w-'If)Wf-D:::~ 15 10 ~ ~ 95 §:« 105 0 No data « -'f-r<)a 10-: ~ 10 24.--continued.I (/) f->-I 10155 a 10 10 101510 •• I 1515· LENGTH IN CM ~ II~ Figure YAKUTAT ••4- ~ j ~ : j j 1~ :~ j 96 Pacific ocean perch--Pacific ocean perch was the dominant rockfish in the GOA and its' biomass totaled 138,000 t in 1990 (Table 13). The areas of highest Pacific ocean perch catch densities and biomass (Fig. 25) occurred in 201-300 m depths on the slope areas of the Yakutat INPFC area (21,900 kg/km2; 28,000 t), Baranof-Chichagof Island (6,200 kg/km2; 6,400 t), Prince of Wales Island (5,000 kg/km2; 20,000 t) and Chirikof Island (2,500 kg/km2; 3,900 t). Deep water (301-500 m) catch rates and biomass were highest on the Southeastern INPFC area's gullies (3,300 kg/km2; 6,900 t) and slope (2,200 kg/km2; 1,800 t) and the Yakutat INPFC area's slope (1,700 kg/km2; 2,000 t). The highest catches and densities shallower than 200 m in depth occurred on the outer shelves of the Shumagin Islands (2,200 kg/km2; 18,100 t) and Baranof-Chichagof Island group (2,200 kg/km2; 9,100 t). The largest average Pacific ocean perch occurred in the 301-500 m depths of the Southeastern (38 cm) and Yakutat (37 cm) INPFC areas (Fig. 26) .. The overall length distribution was dominated by two modes of approximately 29-30 cm and 33-42 cm. 1,3970.60.83,0268,7292,62946,7806,2181,25418,2241,99771,2851,18711,720145138,003(cm)24.128.8Mean38.335.833.031.7(kgIkm2)79433.2(kg)3582522,60152,576CPUE2,31515,22124535,63566224,37511,54110210,5621115,991Biomass4360.72,9760.222.10.222.30.50.20.735.04,1350.837.20.430.6200.532.72,3529,09426,688haulsweightlength3189020275,23059of16830,30726,33113150.737.90.531.10.430.8160.327.40.531.0950.118.20.50.70.60.633.80.532.50.40.532.2140.327.0catch171244870694290.634.1 3,8230.530.90 1728471920.221.6515751552 Hauls17000(t)000 trawlwith36012910658383 11786 708309465 21572156 13413739380 15446235626 2560273631 2916 1812 165582 6863 742 97 (m)11-100I - 100 Mean 97 Area All201301101101Depth depths - --200 200 500300200 All depths 101 - 200 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries All depths Number AllSoutheasternChirikofKodiakYakutatShumagin areas biomass, 95 % confidence interval: 70,993 - 205,013 metric tons (t) All areas Table 13.--TotaI number of survey hauls, hauls containing Pacific ocean perch, estimated CPUE, biomass, mean weight and ALASKA 60° N ~~ .1 58° "W 56° ~ (X) 54° .s.nm..cJ.. CPU[ (KG/Kt12) .• NO CATCH • < 900 • 900 - 14.700 Gulf of Alaska • 14.700 )0 170° W 165° 160° 1550 150° Figure 25.--Pacific ocean perch catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (900 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. 99 No '" o II> '" o vo '"0s::0t) -..-I'-..-I~s::NHtJ1IoW~IQ) L{) II>== 0 Q) 100 SHUMAGIN CHIRIKOF KODIAK 20 U1 15 wOC 10 W 5 a~ o a 5 10 15 20 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 15 oc 1 ~ "j'i5 ~ ~ ~ 10 I ~ f-I 15 I I a ~ 20 o . 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 zo ": w 15 OC i'i: "J ~ J ~ ~ >- 5 ~ 10 a ~ 15 J J J N 8 20 [;: 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 f• Z es 15 85 a.. 10 W ~ "j: No data j No data j ~ 5 t ~ ::i i i g 20 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 20 10 I "j j ~ 10: ~~ ~ ! 15 20 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 LENGTH IN CM Figure 26.--Pacific ocean perch length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. 101 5 LL I wZ=> 2025301520253035404550153540455050152025303540452010150 10 YAKUTAT SOUTHEASTERN TOTAL 0 U~Il-0:::ZU« I-a«Z0we..0::: 205 10 No doto I 1010152010505152010510515>-1510550 10 200 20 fE ••.•.lES U1 0::: • WALESUNS£XEO I•w W No doto ~ o 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 U1 0::: I•w ~W o No o 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 U1 0::: I•w ~W o no No I 10 4015202530354045501015202530354550 "" ~0wI-0:::Ll)W"" U1 J 10 0nI , C; U1 l•I e.. ow -' «-' 10 15 20 25 30 35 40 45 50 10 15 20 25 30 35 40 45 50 LENGTH IN CM Figure 26.--continued. 102 Northern rockfish--Northern rockfish overall abundance totaled 113,000 t (Table 14). Northern rockfish occurred in areas west of Yakutat Bay (142°W long.)and was generally found on the shelf in depths shallower than 200 m, inshore from the areas of highest Pacific ocean perch densities. The highest catches and 90% of the biomass of northern rockfish occurred on the outer shelf of the Kodiak INPFC area (10,600 kg/km2j 53,700 t), the flats west of Portlock Bank (2,000 kg/km2j 14,400 t), and the Shumagin outer shelf (1,700 kg/km2j 13,400 t) and Shumagin Bank (1,600 kg/km2j 23,600 tj Fig. 27). The largest northern rockfish, averaging 39 cm, were found in d~pths of 101-200 m on the Shumagin outer shelf (Fig. 28). The Shumagin length distribution was comprised of two nearly equal modes of 19-30 cm and 31-47 cm. Fewer small «30 cm) northern rockfish occurred in the Chirikof INPFC area and were nearly absent in the Kodiak INPFC area. 103 Table 14.--Total<1,59068,6810.7112,9480.635.70.629.3(cm)41.533.4Mean35.930.534.435.733.135.1(kgIkm2)24,606CPUE491350.529.77285,86521724,08337,78568,93887,73613,56611193Biomass3603810.50.639.0210176055,142weightlengthhauls502920.3of43013070.90.633.80.60.734.40.425.20.50.432.94372841catch2236589171301901 070.6 0.6number51162250.727.6287517543 Hauls17with(t)(kg) 0000 trawl3601291061171721534707 7081371544992 13411 4614933 50.2 567123470.8 232953320.7 125276016180 6841 60 7936(m) of1-1001 - - survey 100 hauls, haulsMean containing northern rockfish, estimated CPUE, biomass, mean weight and Number -- Area .301 201101101Depth -200500 300200 301101 - 200500AllAll201301101 depths depths - 200500300 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries AllKodiakChirikofSoutheasternYakutatShumagin areas biomass, 95% confidence interval: 16,890 - 209,006 metric tons (t) All areas ALASKA <) 60° N 58° .", 56° aI-' ~ 54° Sl.I:1B.OL. CPU[ tKG/Ktt2) + NO CATCH « .00 • 400 - 7. SOO Gulf of Alaska • 1. SOO ,., 1700W 165° 160° 155° 150° Figure 27.--Northern rockfish catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (400 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° oI-' lJ1 Gulf of Alaska 54° lli1IIJ11..~~ + NO CATCH • ~ 400 • 400 - 7.S00 • 1.500 ~ 1500W 145° 140° 135° 132° Figure 27.--continued. 510 ::;, el.::;, >-w::JZ Figure 28.--continued. 108 Rouqheve rockfish--Rougheye rockfish was found in all areas and depths (Table 15, Fig. 29). Large adults were distributed primarily on the slope and gullies in depths deeper than 200 m. The highest rougheye rockfish CPUE was found on the slope in depths exceeding 300 m and averaged over 3,000 kg/km2in the central GOA, nearly 1,000 kg/km2 in the eastern gulf and less than 500 kg/km2 in the far western GOA. Shallow water (1-100 m) rougheye rockfish catches only exceeded 50 kg/km2 off the Kenai Peninsula (900 kg/km2) and the Upper Alaska Peninsula (300 kg/km2). Significant catches occurred in the 101-200 m depth interval off the Kenai peninsula (500 kg/km2), the adjacent shelf off Montague Island (200 kg/km 2) and in gullies off the Albatross Banks (200 kg/km2). The Kodiak INPFC area contained an estimated 60% of the total rougheye rockfish biomass (46,000 t). Similar overall length compositions were found in the Chirikof and Kodiak INPFC areas dominated by two modes of 35 to 40 and 44 to 48 cm. Large rougheye predominated in the Chirikof INPFC area's deepwater (301 to 500 m) slope off the Semidi Islands averaging 40 cm (Fig. 30). Small (under 40 cm) rougheye rockfish comprised 80% of the population in the Yakutat INPFC area. 109 Table 15.--Total3,5673,59110,6300.61,61020,88311,849(cm)0.835.742.835.738.034.2Mean1.341.6length(kgIkm2)46,142563(kg)127265CPUE8,0392,4729311,26425,8131491941,99314701001491,5791,261Biomass4140.942.80.90.733.70.734.60.530.40.734.05,3720.935.2255,7021120.70.80.935.48,3910.933.75,0690.734.11,7855840.5 01,7081.240.42,3629911.01,7221.036.36881551,6231.747.5haulscatch1.239.1weight221,26324259269200112176of140100.8981.240.01.645.81.544.81.038.11711.138.26032181763969444 0number5,82428517529 17Hauls(t)0 trawlwith3601291064053 11765151 70821515456178 13713477106 46232 5629 6047 275 292521797 361815 166843 766 952226090.937.9 (m) of11-100 - survey 100 hauls, haulsMean containing rougheye rockfish, estimated CPUE, biomass, mean weight and Area All301201101301Depth depths - - 500200300 500 201301201101 - - 300500200 101 - 200 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries All depths Number AllYakutatSoutheasternChirikofKodiakShumagin areas biomass, 95 % confidence interval: 25,840 - 66,445 metric tons (t) All areas ALASKA <) 60° N 58° "0' I-' I-' 56° a 54° SUt8.C.1.. crUE tKG/Kt12) NO CATCH ~ 200 • 200 • '.100 1.700 » Gulf of Alaska • 1700W 165° 160° 1550 150° Figure 29.--Rougheye rockfish catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (200 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° f-' f-' f-' Gulf of Alaska 54° Sl.tIB..D.L. CPUF !KC/Kt12) NO CATCH ~ 200 • 200 - 1.700 • 1.700 )0 1500W 145° 140° 135° 132° Figure 29.--continued. 1r - U 0 >-Z :~ j Figure 30.--continued. 114 Duskv rockfish--The majority (90%) of the total GOA dusky rockfish (biomass 27,700 ti Table 16) occurred in the 101-200 m depth interval, and none were found in depths deeper than 300 m. Highest catch rates occurred on the outer continental shelf in 101-200 m depths off Kodiak Island (1,800 kg/km2, Fig. 31), east of Portlock Bank (900 kg/km2), off Montague Island (500 kg/km2) and off the Shumagin Islands (200 kg/km2). Most of the dusky rockfish biomass (58%) occurred in the Kodiak INPFC area. Dusky rockfish length composition was adequately determined only in the depth interval of highest abundance (101-200 m) and averaged 44 cm over all areas (Fig. 32). The proportion of small «40 cm) dusky rockfish was moderate (30%) in the Chirikof INPFC area and low in the other areas. 1.227,73544.043.81.4Mean(kg/km2)(kg)(cm)5495319116,7791,54525,7822,9631,233111921.116,4041,1961,1231720.327.02520.25,5715,80801.745.01.442.10.536.51.142.1124791,7391.41.443.8weightlengthhauls00004071.6of451.4 581.3 1.644.01.6catch01711.544.01.343.045 217515231050.7 6000 6120 3969451 07510272851172Hauls(t) trawlwithCPUEBiomass0000 36075214 1062012934380 1172011 70811093 21542 1371846 1542519 13420108 46235612 25273660296232701.7 181668749210281.8 6 (m)1-1001I - - 100 Mean 115 All areas biomass, 95 % confidence interval: 9,801 - 45,670 metric tons (t) Area-: 201101 - 200300 201301101 - - 500200300 101 - 200 Kodiak 201101Depth --- 200300 301 - 500 All depths Commissionmean statistical length areas based andNumber on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries Table 16.--Total number of survey hauls, hauls containing dusky rockfish, estimated CPUE, biomass, mean weight and SoutheasternChirikofYakutatShumagin . All areas ALASKA " 60° N ~~ 58° """ f--' f--' 56° 54° S11:18.OL. CPUE (KG/KM2) + NO CATCH « 100 • 100 - 1.600 Gulf of Alaska • 1.600 ). 1700W 165° 160° 155° 150° Figure 31.--Dusky rockfish catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than or equal to the mean (100 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 600 N 580 560 I-' I-' ...J Gulf of Alaska ., 540 .s11:1B..OL. CPUF (KG/KI'12) + NO CATCH • < 100 • 100 - 1.600 • 1.600 > 1500 W 1450 1400 1350 1320 Figure 31.--continued. 118 SHUMAGIN CHIRIKOF KODIAK 20 • MALES 10 UNSEXED I-W "~ No,~, data 1 No data ~ 5 10 15 20 25 30 35 40 45 50 25 30 35 40 45 50 25 30 35 40 45 50 20 15 0::U1 w 10 W 5 o~ o 0 N 5 10 ~ I-I 15 I I I ~ 0 [;} 20 o _ 25 30 35 40 45 50 25 30 35 40 45 50 25 30 35 '40 45 50 Z w 15 0:: 40:: 10 I-w : "1 No data J No data j No data ~; !~~ 5 U 10 ~ 15 J J J ~ 8 20 e: 25 30 35 40 45 50 25 30 35 40 45 50 25 30 35 40 45 50 I• Z W0:: 15 W0:: ~ 10 I- ~ "1~ No data 1 No data 1 No data ;~ 5 20:: ] , ] , ] g 25 30 35 40 45 50 25 30 35 40 45 50 25 30 35 40 45 50 20 15 10 ~ 5 ~ W o 0 5 ~4 10 15 20 25 30 35 40 45 50 25 30 35 40 45 50 25 30 35 40 45 50 LENGTH IN CM Figure 32.--Dusky rockfish length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. I 5 No'0::: data w ...Jw« w0::: 303540455030354545503540455030404530354050WALES 2525 ::;;; No data I-::;;;::;;; 0 I-w0:::N 0:::w FE•••.LES w ...J 4050303545201015 2525 Na[j data 0(f)(f)SOUTHEASTERNTOTALNo dataNodatadata (f) (f) 0r<) w«Z0:::I- 5 No- data No data ZU UNSEXED:r:N0wI-W0:::0..u...L()Z=>W 20 0 I m a JI J 119 (f) 0 ~0..0 105 I-0 « r<)«Z0 J II->- 2050 U':r: 102015100 1525 ~~ 15 Vii 20 LENGTH IN CM 15 ~ L YAKUTAT j :1 1 1 J1j1 :1 J :~ 1 Figure 32.--continued. 120 Sharpchin rockfish--The sharpchin rockfish total biomass (37,000 t, Table 17) was concentrated (85%) in the Southeastern INPFC area, most of which (99%) was caught in the 101-200 m and 201-300 m strata off Prince of Wales and Baranof Islands (Fig. 33). West of the lower Cook Inlet area sharpchin rockfish abundance was negligible. Most (90%) of the sharpchin rockfish were less than 30 cm in length and averaged 26 cm (Fig. 34). 0.10.20.44,560<1,76231,341(cm)25.021.527.2Mean17.784837,0503,172CPUE24,1762,5333,14912,8461,328Biomass0.10.322.620.221.10.2470.224.14120.1 038,37011141,201haulscatch200039of122,9600.2280.2 2100.321.60.324.70.317100 3946 2933000320.1 030.2 7500051028170Hauls1 trawlwith00 36050107 1292473 10600 21511735677 70895125 13425 1371 154 20.1 46000 562317 30.2 25414 292719 3612246 6010 160 18684691 7 (m)11-100 - 100 Mean All areas biomass, 95% confidence interval:<(kg/km2)length(kg)weight 7,486(t) - 66,614 metric tons (t) 121 Area 201301Depth - 300500 All301 depths - 500 201301101 - 200300500 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries -- All depths All depths Number YakutatSoutheasternShumagin ChirikofKodiak Table 17.--Total number of survey hauls, hauls containing sharpchin rockfish, estimated CPUE, biomass, mean weight and All areas ALASKA <) 600 N 58° ,. I-' N 56° N 540 .s..IJ:1fiD.L. crUE (KG/Kf12) + NO CATCH < 200 • 200 - 4.600 ".600 » Gulf of Alaska • 1700W 1650 1600 1550 1500 Figure 33.--Sharpchin rockfish catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (200 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° f--' tv W Gulf of Alaska 54° SI11B..C.1.. CPUE (KG/Ktt2) + NO CATCH • < 200 • 200 - 4.600 • 4.800 ,. 1500W 145° 140° 135° 132° Figure 33.--continued. 124 SHUMAGIN CHIRIKOF KODIAK fEMALES 0:::. 10 UNSEXED W "j: No data •~ No data j No data "~ 5 10 15 10 15 20 25 30 35 40 10 15 20 25 30 35 40 10 15 20 25 30 35 40 15 (I) IX 10 ~ W 5 No data No data ~ o o N0 5 I I-I 10 0 ~ 15 o 10 15 20 25 30 35 40 10 15 20 25 30 35 40 10 15 20 25 30 35 40 o ~ IX ~ 10 ~ ~ " : j " ,~, 1 " ,,', 1 " ,,', "; 3: U>- 5 is 10 ~ ~ ~ ~ =:J 8 15 e: 10 15 20 25 30 35 40 10 15 20 25 30 35 40 10' 15 20 25 30 35 40 I• Z W 15 (I) ~ IX W 10 W ~ WI- 5 No data No data No data o~ o ~ 5 I o lOr<) 15 " " " " " 10 15 20 25 30 35 40 10 15 20 25 30 35 40 10 15 20 25 30 35 40 15 '~j ""', j " 'm, 1 ~ 10 1t- ~ 15 10 15 20 25 30 35 40 10 15 20 25 30 35 40 10 15 20 25 30 35 40 LENGTH IN CM Figure 34.--Sharpchin rockfish length composition during the NMFS 1990 Gulf of Alaska groundfish survey by International North Pacific Fisheries Commission statistical area and depth. w 10-: -1 f- Q:: W aQ:: WQ:: 202530354030401520253035403540303540152530352530354015205IIAlES 101015 101520 10152025 1010152025303540 "'!j ::; V1 No dataNodotodata w f-NQ:: wQ:: FEYALES w W 2025202530354020353025154015202515 1010 ::; -1::; aV1SOUTHEASTERN-1No dataTOTAL V1 ::; an «Wf-Q::Z 5 No datadota UU Zn«N0w~If)f-0-WQ::u...UNSEX-'::Ja ED 15 125 If-~0-a 105f-0 - Z« a-'I 10 ii >- 1015 a 10 i 11 o· 10151015 •• 15 LENGTH IN CM I ~ ~ YAKUTAT 10 1 ~ ~ ~ ': j jj ': 1 1 1 I : j +- 1 :~ 1 Figure 34.--continued. 126 Short raker rockfish-- Shortraker rockfish distribution was the deepest and most depth restricted of any major rockfish with 90% of the total biomass (10,800 ti Table 18) centered on the upper slope (301-500 m). High catch rates occurred on the Yakutat INPFC area's slope (3,100 kg/km2, Fig. 35), Spencer Gully (1,200 kg/km2) and the Chirikof and Kodiak INPFC area's slopes (each exceeded 700 kg/km2). Largest of the GOA rockfish, short raker rockfish averaged 61 cm in length and 4 kg in weight during the 1990 survey. Short raker rockfish ranged in length from approximately 21 to 88 cm over all areas (Fig. 36), although few were less than 45 cm. 1,45410,80924.626.056.0Mean59.3(kg/km2)536(kg)(cm)CPUE141665.04,9202,311141,5821,633Biomass5123.74.657.44.53.126.23.344.027.14.056.04.263633.227.12,237103.926.049,8461,467haulscatchweightlength1,547031132853.224.64524.857.8387594214.0of3898562.4 4.056.0353.5 I34,309 0171075000280005101700 Hauls4with(t) trawl03605106000 1291117713 215524 7085036 154426 1371342691 46000 56231 2912193.2 2519 270 60364391905.8 1810 16681189 479128783.424.7 63756 (m)11-1001 - - 100 100 Mean 127 All areas biomass, 95% confidence interval: 4,976 - 16,642 metric tons (t) Area 301Depth - 500 201301 - 300500 201301101 - 200300500 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries All depths-- Number Table 18.--Total number of survey hauls, hauls containing shortraker rockfish, estimated CPUE, biomass, mean weight and SoutheasternChirikofKodiakYakutatShumagin All areas 600 N ~~ 580 "'!7 I-' tv 560 00 540 .s.I.tIaQ.l CPUE (KG/KH2J + NO CATCH 170° W 1650 1600 1550 1500 Figure 35.--Shortraker rockfish catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (100 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. 129 z o CD « ~ en « «...J ~ + ••• ~ 'Vcu ~.•....::c::s.•...0CI) ~ It> 0 '0()0 I ("")~ 0 -r-!~s::HtJ1s::oWQ) 3:0 L() Q) -i0:: "ALES-: ::E No data f-I W0:: « u- FEMALESUNSEX ED wW 35455565758535455565755535354545556575858565758515105 25 No data a(f) CHIRIKOFKODIAKNo datadataNodata 0::W No data a0::E0WI nNa(f)0::f- ::JW0::wCLf- 5 Nf-W~0::l{)ZCL 15 25and1990 (f) wa ~IZ0::W 1050 No doto ZU«U Zf-aI« 10depth. ~GulfofAlaskaPacificFisheriescompositionbygroundfishsurveythe36.--ShortrakerrockfishlengthCommission~I duringareaNorth ~ 130 (f) I>- 155 a an-i 25 1010 NMFSInternationalstatistical 10151510 •• 15 LENGTH IN CM Figure SHUMAGIN j~ j :~ j 1 :~ j 131 YAKUTAT SOUTHEASTERN TOTAL 1 0 _ UNS[)([D [5 : No data No data No data ~ "1 =~ j m 5 10 15 25 35 45 55 65 75 85 25 35 45 55 65 75 85 25 35 45 55 65 75 85 15 (f) 10 I•[5 W 5 No data No data No data :;; o o 0 N 5 I I 10 0 f-- ~ 15 o 25 35 45 55 65 75 85 25 35 45 55 65 75 85 25 35 45 55 65 75 85 o Z j '0 '0'0 j '0 '~o j ~ ~ i:~>- 5 U Z W 10 ::> i i i I ~ 8 15 E 25 35 45 55 65 75 85 25 35 45 55 65 75 85 25 35 45 55 65 75 85 Zf-• W 15 ~ (f) W 10 a:: ~ W~ 5 :;; o g Ii) 5 I 10 0 f') 15 25 35 45 55 65 75 85 25 35 45 55 65 75 85 25 35 45 55 65 75 85 15 5 ~ :. ~ ...... "j j _~ ;m 10 15 25 35 45 55 65 75 85 25 35 45 55 65 75 85 25 35 45 55 65 75 85 LENGTH IN CM Figure 36.--(continued) 132 Shortspine thornvhead--Shortspine thornyhead abundance declined across the GOA from a biomass of 7,600 t in the Southeastern INPFC area to 1,700 t in the Shumagin INPFC area (Table 19). Highest shortspine thornyhead catches averaged approximately ,1,000 kg/km2 on the Southeastern INPFC area's deep (301-500 m) southeastern slope and-gullies (Fig. 37) and the Baranof-Chichagof slope (101-200 m) and on the Chirikof INPFC area's deep (301-500 m) slope. Shortspine thornyhead lengths ranged from approximately 5 to 45 cm, although over 50% of the fish did not exceed 25 cm (Fig. 38). 133 Table 19.--Total0.71,171<269908(cm)19,33826.722.922.022.321.529.024.725.0Mean(kg/km2)length(kg)4,214.2,0343,805487CPUE2,9291,3711,739Biomass0.221.60.30.229.00.20.228.81110.3272,1260.214.60.20.323.70.30.322.30.10.222.6301,44312,7257,547247,5388,8711,4831,3991,4441,569weighthaulscatch5530753949960.225.31247of0.214.618184171000133,3790 7370.422.5number280007505100 17000532 Hauls(t) trawlwith0000 3603010601294 11784211 2152739 70817165 1347078 1371542313146 461 56 52525 3633287 292725541 6057684 161485510.424.7 1818 6856424 44 769 (m) of1-1001 - survey 100 hauls, haulsMean containing shortspine thornyhead, estimated CPUE, biomass, mean weight All areas biomass, 95 % confidence interval: 15,200 - 23,476 metric tons (t) Area 201301301201Depth - - 300500 500300 201 - 300 201101 - 300200 Commissionand statistical mean length areas based and depth on the intervals. 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries AllAll301 depths depths --- 500 Number SoutheasternKodiakYakutatChirikofShumagin All areas ALASKA 600 N ~.~ 580 "9 f-1 W 560 ~ 540 ~ CPU[ (KG/Kt'l2) + NO CATCH < 100 • 100 - 600 600 :> Gulf of Alaska • 1700W 1650 1600 1550 1500 Figure 37.--Shortspine thornyhead catch distribution and relative abundance during the NMFS 1990 Gulf of Alaska groundfish survey. Catch abundance categories are: 1) none, 2) less than the mean (100 kg/km2), 3) between the mean and two standard deviations and 4) greater than two standard deviations above the mean. ALASKA 60° N 58° 56° I-' W U1 Gulf of Alaska ., 54° S1J:1B.D1.. CPUE (KG/KM2) + NO CATCH • • 600 ;> 1500W 145° 140° 135° 132° Figure 37.--{continued) aaw t-a . (/);;N LL 2030405060706020304050405050607060707010uQlIlIHlIIIIIIIr.'wl1H111111111!>-'OHlIlIlIllIlIllllo-WJIIl111111111111P-MALES 50607010 10203040 10203040506070102030 1020304050 t--1(/)a::J (/)(/) NoI dataNodata 40 t- a a a::w FEW.ALES w - L 1II II TOTAL L UNSEX ED o u•• aSOUTHEASTERN W t- t-wa..a:: 05 I - ZUW Z:r:t-Wt{)~=>a::a..w-I 105 -~10 J ~~ a:: w a n ~a::w«Z 5a5 -1 No data 10 « aLu«Nwz I II 137 (/) a Ia 5 ~f ..-.yjIlIIlIlIlIlRI!IIII. t- n-I,I 10- ;; i_ ~t- 1-'Ml1l1H1Q~ I i. JJ :r: 10 10 LENGTH IN CM .•...5 .&.LI-~.,,~.•.-J t 10 105 J i- o 1 YAKUTAT r r : 1 1 j Figure 38.--{continued) 138 Other rockfish--Seven other rockfish species were prominent during the 1990 GOA survey: reds tripe rockfish (Sebastes proriqer), harlequin rockfish (Sebastes varieqatus), silvergray rockfish (Sebastes brevispinis), redbanded rockfish (Sebastes babcocki), yellowmouth rockfish (Sebastes reedi), yelloweye rockfish (Sebastes ruberrimus), and rosethorn rockfish (Sebastes helvomaculatus) . Redstripe rockfish abundance totaled 24,700 t and was concentrated (80%) in the Prince of Wales lower Baranof Island shelf area in depths of 101-200 m. Redstripe rockfish had high catch abundance on the contiguous shelf areas of Prince of Wales Island (2,400 kg/km2) to the southern tip of Baranof Island (1,200 kg/km2) in the 101-200 m depth interval (Table 20) and did not occur west of Cook Inlet. Lower catch rates occurred on the slope areas off Prince of Wales Island (700 kg/km2) and Baranof Island (10 kg/km2). A second area of abundance occurred over 400 nmi to the northwest along the shelf off Montague Island in two depth intervals, 101-200 m (400 kg/km2) and 1-100 m (50 kg/km2). Between Prince of Wales and Middleton Islands, catch rates did not exceed 15 kg/km2. The majority of the harlequin rockfish catch and 70% of the total biomass (17,200 t) occurred off the Kenai Peninsula in depths of 101-200 m on the outer shelf (1,500 kg/km2j 7,800 t) and Portlock Flats (500 kg/km2j 3,800 tj Table 21). Prince of Wales Island was another important harlequin rockfish area on the shelf (200 kg/km2j 1,400 t) in depths of 101-200 m and on the 139 slope (200 kg/km2; 1,000 t) in depths of 201-300 m. Silvergray rockfish did not occur west of Cook Inlet, except for a single catch in Shelikof Strait at less than 1 kg/km2 (Table 22). Catch rates averaged 700 kg/km2 on the Prince of Wales and Middleton Island shelf areas in depths of 101-200 m and exceeded 900 kg/km2 on the Prince of Wales slope in depths of 201-300 m. Approximately 95% of the total silvergray rockfish biomass (13,800 t) occurred on the shelves off Prince of Wales Island and Montague Island. Silvergray rockfish had the second largest average length (47 cm) of any rockfish encountered in the GOA. The majority of the redbanded rockfish catch occurred between Cape Fairweather and Dixon Entrance on the outer shelf and slope in depths of 101-300 m. Total biomass of redbanded rockfish was only 3,200 t (Table 23) and distributed primarily on the Yakutat INPFC area's Fairweather shelf (1,200 t) and the Southeastern INPFC area's Prince of Wales shelf (600 t) and Baranof-Chichagof shelf (300 t). Two other prominent areas for redbanded rockfish biomass were found in the Southeastern INPFC area's Prince of Wales slope (400 t) in depths of 201-300 m and deep gullies (200 t) in depths of 301-500 m. Yellowrnouth rockfish was taken in only three catches during the 1990 GOA survey (Table 24) and over 95% of the total yellowrnouth rockfish biomass (1,900 t) can be attributed to a single catch in Dixon Entrance near the U.S.-Canada border. A trace catch was reported in the far western Shumagin INPFC area. 140 Yelloweye rockfish total biomass (1,000 t, Table 25) was primarily (90%) distributed on the shelf in depths of 101-200 m at an average density of 200 t in each of. the following areas: the Kenai Peninsula, Baranof and Chichagof Islands, Cape St. Elias and Prince of Wales Island. Rosethorn rockfish, total biomass (700 t; Table 26) was predominately (99%) located off Prince bf Wales Island in depths of 201-300 m (400 t) and 101-200 m (300 t) .. This species did not occur west of Baranof Island. 0.21,85918,3551,196<24,6810.11030.134.029.7Mean35.934.8(kgIkm2)length(kg)(em)21,373CPUEBiomass632,9243,3873,0030.60.433.600.536.90.52,924weighthaulscatch1021,279of0.434.00.418.00.436.90.433.601711338400002 05128750171233842Hauls3with(t) trawl00 36017177 129106150.2 151171182 2157082983 137134154462313 5629250 362711581 6016186824 40 7960 (m)1-100 Mean 141 Area 201201301101Depth - - 300500200 300 201 - 300All201301101 depths - 300200500 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries Number SoutheasternAllShumagin areas biomass,Yakutat 95%KodiakChirikof confidence interval: 0 - 50,045Table metric 20.--Total tons (t) number of survey hauls, hauls containing redstripe rockfish, estimated CPUE, biomass, mean weight and All areas 0.20.1<0.40.117.7(cm)17,19420.644.920.1Mean19.0(kg/km2)length17.7294930.127.0(kg)CPUE2515,15012,6821451,52512,6421,264Biomass0.20.225.15130.126.62,57621260.444.90.223.501,662I1I1haulscatchweight00.20.344.9of0.223.50.332.27190.1 217144 1465270.2 1910500.2 91819110.119.830.2 330.3 028I751511Hauls595450.244.9 317with0 trawl36052126 12925293 110.5 1061172243 7088358 21529130 1371541341923 474628i21 2316168 60.2 50.2 566 2527605 2933370.4 3618166827 7000 496 (m)I1-1001 - 100 Mean 142 All areas biomass, 95% confidence interval: 0(t) - 34,961 metric tons (t) Area 301201101301101Depth - - 500200 300500200 All201301101 depths - 200500 300All301101 depths - 500200 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries -- Number ChirikofSoutheasternYakutatKodiakShumagin Table 21.--Total number of survey hauls, hauls containing harlequin rockfish, estimated CPUE, biomass, mean weight and All areas 0.30.52.2<18446.413,77444.00.849.9Mean36.9(kgIkm2)440735(kg)(cm)CPUEBiomass4529,9895,3495,4323,7721.404614,3421.749.91.21.344.03,7031.78,0451.750.9weightlengthhaulscatch1.751.8026of131.447.2017114141710648000 72.2 6911272.2 0 750002851000772931710Haulswith1(t) trawl03602983 10612911770821573293 15413414101 137568 70.3 7 4462325290 60362716186840 796 (m)1-1001 - 100 Mean 143 Area Number -- ": 201301Depth - 300500 300 All201301101 depths - 200300500All201301101 depths - 500200300 KodiakCommissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries AllYakutatSoutheasternShumagin areas biomass, 95%Chirikof confidence interval: 1,480 - 26,068Table metric 22.--Total tons (t)number of survey hauls, hauls containing silvergray rockfish, estimated CPUE, biomass, mean weight and All areas 0.3<0.8(cm)0.741.5Meanlength2,163(kg)3,17369CPUEBiomass421,5211,4341,2330.630.62.131.3400.91.632.8027964850.51.241.5hauls1I025000310.9 620.6 18of1990.8 195171000catch48238060.6 0000526 07502851003Hauls170with0000 310.9 3602718 trawl12971061177088911 2151221880.9 13713427 154462313858370.830.6 564 2527295111261.1 601416204 36189 16000 684785 7469 (m)11-100 - 100 Mean All areas biomass, 95% confidence interval:(kgIkm2)weight 705(t) - 5,641 metric tons (t) 144 Area 201201-Depth - 300 301201301 - - 500 500300 201301101 - 200300500 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries -- All depthsAll depths Number SoutheasternShumagin KodiakYakutat Chirikof Table 23.--Total number of survey hauls, hauls containing redbanded rockfish, estimated CPUE, biomass, mean weight and All areas 0.3<1.41,900(cm)10662.2Mean(kgIkm2)51(kg)1,834Biomass61.458.501.558.51.5611,8951,834weightlengthhaulscatch1661.0 000of610000171000021 0I750285100 0Hauls1700 withCPUE123I(t) trawl0000 36010601290 1172150 70815413713400 4623 50.3 5271364 5600 2900 2560000 36000 1618684670 90 (m)11-1001-100 - 100 Mean 145 -: Area 301Depth - 500 201201 - - 300 300All301201101 depths - 200500300 Kodiak Commissionand statistical mean length areas based and depth on the intervals. 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Number AllShumagin areas biomass,Chirikof 95%SoutheasternYakutat confidence interval: 0 - 5,772 metricTable tons24.--Total (t) number of survey hauls, hauls containing yellowmouth rockfish, estimated CPUE, biomass, mean weight All areas 0.60.8<<5.1(cm)2.21,02718.01.8Mean1.834.831.318.0(kgIkm2)(kg)223893.4Biomass2938662.4813730111371242.7 haulsweightlength12410000of7catch01710002006393893.4 12242.7 0 128051075476269Hauls363162.9 171withCPUE1(t) 240trawl36012910611712158708223 137154134 660.6 4656261792.2 2325000 29360 270 601618686 74690 (m)1-1001 - 100 Mean 146 Area -: Number -- 201Depth - 300 201301101 - 300200500 300All301101 depths - 200500 KodiakCommissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries AllYakutatShumagin areas biomass,ChirikofSoutheastern 95 % confidence interval: 422 - 1,632Table metric 25.--Total tons (t) number of survey hauls, hauls containing yelloweye rockfish, estimated CPUE, biomass, mean weight and All areas 0.2<0.2(cm)Mean(kg/km2)(kg)272676920.2814070.2025396870.21weightlengthhauls11300000280of2670.217130.2 2catch1710002000 50.5 0 51000287521700 0Hauls09(t)0 trawlwithCPUEBiomass36012910621511719124120.2 70830137000 154134560 460 50.5 239 252936276016000 182 68467900 (m)11-100 - 100 Mean 147 Area Depth All201301 depths - 500300All201301101 depths - 200500300 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries All depthsAll depths Number Table 26.- Total number of survey hauls, hauls containing rosethorn rockfish, estimated CPUE, biomass, mean weight and Shumagin AllSoutheastern areas biomass,YakutatKodiakChirikof 95 % confidence interval: 307 - 1,077 metric tons (t) All areas 148 Other flatfish--Four other prominent flatfish species of the GOA survey included the Alaska plaice (Pleuronectes quadrituberculatus), English sole (Pleuronectes vetulus), butter sole (Pleuronectes isolepis) and starry flounder (Platichthvs stellatus) . Over 95% of the total Alaska plaice biomass (6,100 tj Table 27) carne from the 1-100 m depth interval in the Shumagin and Chirikof INPFC areas. None were taken east of Albatross Banks in the Kodiak INPFC area. English sole was caught throughout the GOA primarily at low levels in depths less than 100 m. The majority (80%) of the total biomass (6,800 tj Table 28) was taken from the Yakutat INPFC area. Approximately 80% of the butter sole biomass (17,000 t, Table 29) occurred in three Kodiak INPFC area locations less than 100 m in depth, the Albatross Banks (9,600 t), lower Cook Inlet (2,200 t) and Albatross Shallows (1,500 t) Starry flounder abundance totaled 11,200 t (Table 30), of which 80% occurred in three areas, the Kodiak INPFC area's Lower Cook Inlet (3,600 t) and Albatross Banks (1,900 t) and the Yakutat INPFC area's Middleton Shallows (3,800 t). None. were available in depths deeper than 100 m. Starry flounder was the second largest flatfish taken during the survey and averaged 1.7 kg in weight and 46.8 cm in length. 1.8(cm)1.91.347.3Mean(kgIkm2)(kg)2,2422,283362,9523,066676,1065,951Biomass2132087561.341.91.242.41.242.7weightlengthhaulscatch0of18231.2 00171154700000 28114684 19210 28512197561.347.3 7571700 Hauls948 withCPUE(t)00 trawl36031 129010611 215211711231.2 7081371548 134000 46230 5625000 29276000 36000 18161 68400 760 90 (m)11-100 - 100 Mean 149 Area 101Depth - 200 301201 - 500300 All201301101 depths - 200500300 statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission Number AllKodiakChirikofYakutatShumagin areas biomass, 95%Southeastern confidence interval: 1,458 - 10,753Table metric 27.--Total tons (t)number of survey hauls, hauls containing Alaska plaice, estimated CPUE, biomass, mean weight and mean All areas 0.70.5<0.9<(em)1.042.136.736.339.1Meanlength234(kgIkm2)(kg)209030.65,273CPUEBiomass6,7555,1441,602159340.71,3410.842.146400.80.516962311.10.637.30.637.5409831411.031390.63185237741I3,932haulsweight0of151.3 132840.7780.5 20catch17117454051.0 1120 753281513171062Haulswith1(t)0 trawl3602613 1061298 2151172 708137134154463 90.8 45610 23250 360 29276018000 160 685 4796 (m)11-100 - 100 Mean 150 Area -: 201101Depth - - 200 300 201301201301101 - - 300500 200500300All301101 depths - 200500 Kodiak statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission All depths Number SoutheasternAllChirikofShumagin areas biomass,Yakutat 95% confidence interval: 760 - 12,749Table metric 28.--Total tons (t) number of survey hauls, hauls containing English sole, estimated CPUE, biomass, mean weight and mean All areas 0.8<11017,448(em)28.731.7Mean(kg)CPUE17,4201,06613,2891,2471,84713,2611,0661,247Biomass0.328.70.434.10.30.50.531.701,8471281haulscatch00000018333of0.329.50.329.317137137000 28740 5175928 0Hauls334 173919 10280.8 trawlwith3601291061170 21519136 7083859 134154717 1374623562529270 3660000 180 166800 47600 9000 (m)1-1001I - 100 Mean All areas biomass,95% confidence interval:(kg/km2)weightlength 3,455(t) - 31,441 metric tons (t) 151 Area 101Depth - 200 201 - 300 301201101 - 200500300 statistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission -- All depths Number SoutheasternYakutatKodiakChirikofShumagin Table 29.--Total number of survey hauls, hauls containing butter sole, estimated CPUE, biomass, mean weight and mean All areas 41.411,179(cm)53.3Mean(kg/km2)(kg)5,545383,777261,6742.051.05,5452.32.353.31832.803,77771.11.141.4haulsweightlength000of101391.746.6catch01711888400 0 28275510Hauls270 172224 (t) trawlwithCPUEBiomass0360000 129000 1061170 2151057 7081838 1374 134154231832.8 46000 23000 5600 250 36000 60000 29000 271816000 680 4000 6000 70 900 (m)1-1001I - 100 Mean 152 Ail areas biomass, 95 % confidence interval: 938 - 21,420 metric tons (t) Area 101101Depth - - 200 200 101 - 200 201301101 - 300200500 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries -- All depths Number SoutheasternChirikofYakutatShumagin Kodiak Table 30.--Total number of survey hauls, hauls containing starry flounder, estimated CPUE, biomass, mean weight and All areas 153 Skates--Skates were grouped into one category for analysis because of the uncertain taxonomy for many skate species. Skates biomass totaled 49,400 t (Table 31) and 90% occurred in depths shallower than 200 m. The INPFC areas of highest abundance were respectively Kodiak (19,900 t), Yakutat (14,100 t) and Chirikof (11,900 t). The Southeastern INPFC areas skate abundance was underrepresented due to the lack of sampling in depths shallower than 100 m. Skates had the highest average weight (8 kg) of all species and the largest occurred in depths shallower than 200 m. No skate length data were collected. 0.12.31.4<5.6(cm)3.01.6Mean(kgIkm2)49,394(kg)4620611,86127CPUE15,083296796714.215.12,71031,3852,04714,6951033,02817.419,86214,080Biomass7.4477.24,4543,36911.54.59.45.01,5697,7198.71250I1172175,9986,92376weightlengthhauls2720369000of15627127.911245633.317327.815136.51469.77.939catch52452468458 8431231.5 17189 08051289261 7517Haulswith(t) trawl00 36012910631142 11721588204 708224166 15448187 13719 13452262 5646235302954.6 29256 13611582824.5 10.2 6016 274 168136 1868961 47 (m)1-1001-1 - 100 Mean 154 Ail areas biomass, 95 % confidence interval: 35,465 - 63,323 metric tons (t) Area Depth 301201101201101 - - - 200500300 300200101 - 200 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries AllAll depths depths--All depths Number Shumagin KodiakYakutatSoutheasternChirikof Table 31.--Total number of survey hauls, hauls containing skates combined, estimated CPUE, biomass, mean weight and All areas 155 The following four species form dense aggregations and tend to occur off bottom, and consequently these species were inadequately sampled by the bottom trawl survey and catch estimates are probably low. Smelt--AII smelt (Family Osmeridae) species combined had a total biomass of 28,500 t, 70% of which was in the 101-200 m depth interval (Table 32). Highest smelt abundance centered on the inner shelf areas off the Kenai Peninsula including the Kenai Flats (3,900 t), Portlock Flats (3,700 t) and Barren Islands (2,300 t) of the Kodiak INPFC area, and high concentrations extended east to Alsek Valley (Yakutat INPFC area) and west along the Chirikof INPFC area's Shelikof Edge (1,400 t) and just into the Shumagin Gully (1,600 t). Pacific herrinq--Approximately 90% of the Pacific herring (Clupea pallasi) biomass (15,300 t) occurred in depths shallower than 100 m in the Chirikof and Yakutat INPFC areas (Table 33) . Important herring areas included the upper Alaska peninsula (5,800 t) and Chirikof Bank (2,900 t) in the Chirikof INPFC area, and the Yakutat INPFC area's shallows (5,600 t) extending from Cape St. Elias to Cape Fairweather. Atka mackerel--Over 95% of the total Atka mackerel (Pleuroqrammus monoptervqius)biomass (30,500 t) was distributed in the Shumagin INPFC area's far western Fox Islands area in depths shallower than 100 m (Table 34) . Red squid--Widely distributed in most areas and depths, red squid (Berrvteuthis maqister) catch rates were low. The overall 156 biomass (4,200 t) was centered (60%) within the Kodiak INPFC area (Table 35). Abundance appeared to decrease in shallow depths (1-100 m) and in the outer GOA in the Shumagin INPFC area and Southeastern INPFC area. <28,540(cm)134Mean2712,420(kgIkm2)length(kg)20,663CPUE1155810.123211420012,8551301,52010610,024Biomass414223710.16,7115,4246,6453,083All313219512381,9151,3115,8348541601,3253,1161haulscatchweight12292800030610of1311069617152195772152562981233 092875511710Hauls(t) trawlwith00 360169172depths10635 1712911721570813714 154134461127397 239 5652 2919 258824 6013333 362716186827108 4000 79000 6000 (m)1-1001 - 100 Mean 157 Area Depth -: 301 - 500All301101All101201301101 depths201301101201 -101depths -201 500200 -200 200300500 - - - 200300500 200300 300 300 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries AllAll depths depths- All areas Number Shumagin ChirikofKodiakSoutheasternAllYakutat areas biomass, 95% confidence interval: 20,979 - 36,100 metric tons (t) Table 32.--Total number of survey hauls, hauls containing smelt combined, estimated CPUE, biomass, mean weight and 0.2<0.1(cm)15,315Mean346(kgIkm2)length(kg)CPUE14,571143290.1Biomass1170.16,1820.109,012125,81918,6842690.1 1weighthauls035712110.1ofcatch11712511400030115200 7160.1 250191460.1 50 288327 7551217Hauls000 360346736 trawlwith1061291178 2157086752 13415410142 137000 20.1 4 40.2 46000 235680.1 253660000 27291 1618000 682 647000 9 (m)1-1001I - 100 Mean 158 Ail areas biomass, 95% confidence interval: 0(t) - 32,053 metric tons (t) Area Depth 201301101 - 200500300 300All201301101 depths - 200300500 Commissionmean statistical length areas based and on depth the 1990 intervals. Gulf of Alaska groundfish survey. by International North Pacific Fisheries --All depths Number Shumagin SoutheasternYakutatKodiak Chirikof Table 33.--Total number of survey hauls, hauls containing Pacific herring, estimated CPUE. biomass, mean weight and All areas 0.9<1.1686475(cm)28.7Mean(kgIkm2)length30,473(kg)CPUE30,45030,462Biomass01113haulscatch1weight000of0.829.30.80.823.10.833.51715239000000 755512800071700 0Hauls0(t) trawlwith0000 243603129 111.4 10611177088103 2151541 1371340 462 560 23250 2900 2736000 60180 16680 7496 (m)1-10011-100 - 100 Mean 159 Area 101Depth - 200 201201 - - 300 300 All301201101 depths - 200500300 Commissionmean statistical length areas based and on depththe 1990 intervals. Gulf of Alaska groundfish survey, by International North Pacific Fisheries Number AllChirikofShumagin areas biomass,Kodiak 95 %SoutheasternYakutatconfidence interval: 0 - 92,488Table metric 34.--Total tons (t) number of survey hauls, hauls containing Atka mackerel, estimated CPUE, biomass, mean weight and All areas 0.30.4(cm)0.30.2Meanlength(kg/km2)4,157(kg)1,362208000.32,440350.2927301440.10.27221060.5270weighthaulscatch1111347707012491240.2of9630.39050.23890.2121150.2 171440002925090.6 80.3 0570.1 51428251270.5 75Hauls61744 (t) trawlwithCPUEBiomass00 3602412910229540.2 10611749 70812614 215134137621480.2 1541684790.3 232 566102860.4 462 602912434930.3 271224 2523912710.1 3615 1817902600.2 16816190 6831 6365193 742 925 (m)11-100 - 100 Mean 160 All areas biomass, 95 % confidence interval: 2,665 - 5,649 metric tons (t) Area -: Depth 201301101 - 200500300 101 - 200 Kodiakstatistical areaslength and based depth on intervals. the 1990 Gulf of Alaska groundfish survey, by International North Pacific Fisheries Commission All301201 depths --- 500300 Number Shumagin SoutheasternYakutatChirikof Table 35.--Total number of survey hauls, hauls containing red squid, estimated CPUE, biomass, mean weight and mean All areas 161 Age Composition Data At the time of this report, the age composition was available only for walleye pollock and Pacific ocean perch. The walleye pollock age data results were determined for 3,300 pollock and did not include a large proportion of crystallized otoliths which do not have distinct annuli and are consequently unageable. The overall walleye pollock age distribution ranged from 2 to 18 years and averaged 7 years (Fig. 39). The 1984 pollock year class (age 6) was dominant in the Shumagin, Kodiak and Southeastern INPFC areas. Pollock populations in the Chirikof and Yakutat INPFC areas were dominated by the 1987 year class (age 3) and had a prominent 1988 (age 2) year class. The most prominent older pollock were the 1978 year class (age 12) in each area. Pacific ocean perch age composition was determined from 1,766 fish (Fig. 40). The age distribution over all areas and depths ranged from 2 to 75 years and averaged 10 years, dominated by the 1984 and 1986 year classes (ages 6 and 4). Overall, no older (>age 10) Pacific ocean perch were prominent, except for the 1976 year class (age 14) that represented 6% of the total population. Young Pacific ocean perch «age 10) were only dominant (87%) in the INPFC Shumagin area. The oldest population, with 42% of the fish older than age 10, was found in the Yakutat INPFC area. In this area, Pacific ocean perch averaged 13 years of age over all depths. 162 Q,) 10. Q. Q,) 1051520 0 INPFCQ. Area c.:I 10 10. 0 Shumagin Ageaverage=Yakutat20 (years) age 5 Q,) 0 B 10 INPFCaverage Area age 7 Age (years)= 20 Q,)10. 0101520101520INPFC56 Area 0 Q. c.:Ic••10 20 Q,)10.c 5 Chirikof average ageSoutheasternINPFCAge (years) Area Q.c.:I 10 ": average0 age •• 20 Age (years) Kodiak All INPFC Area INPFC Areas average age 8 average age 7 •• 200101520 •• 2001051520 Q,)10.c 5 Q,)10.c Q.c.:I 010 Q.c.:I 010 Age (years) Age (years) Figure 39.- -Walleye pollock population proportioned by age, using age and length data from the NMFS 1990 Gulf of Alaska survey by International North Pacific Fisheries Commission statistical area. 163 Shumagin INPFC Area Yakutat INPFC Area average age 6 average age 13 c ~ 20 •. 10 IIII ~~30iJ0 II,", I r IIIIII J~15iJiJ1~ ,.••• , , , , , , , , , , , o 10 20 30 40 50 60 70 o 10 20 30 40 50 60 70 Age (years) Age (years) Chirikof INPFC Area Southeastern INPFC Area average age 11 . average age 11 ~ 10 ~ ~ 5 Q.~15it0 ,. I" r' I. I , I I I I r II J ~~lJu,..,",, , , ,, , , , ,., o 10 20 30 40 50 60 70 o 10 20 30 40 50 60 70 Age (years) Age (years) Kodiak INPFC Area All INPFC Areas average age 11 average age 10 ~ 10 ~ ~ 10 . ~ 5 Q.~15li.J0 ,.....,.I'"""'r r" 'P I "I IIIII ~:~15~ """/" r IIIII III, o 10 20 30 40 50 60 70 o 10 20 30 40 50 60 70 Age (years) Age (years) Figure 40.- -Pacific ocean perch population proportioned by age, using age and length data from the NMFS 1990 Gulf of Alaska survey by International North Pacific Fisheries Commission statistical area. 164 CITATIONS Alverson, D.L., and W.T. Pereyra. 1969. Demersal fish explorations in the northeastern Pacific Ocean -- An evaluation of exploratory fishing methods and analytical approaches to stock size and yield forecasts. J. Fish. Res. Board Can. 26:1985-2001. Brown, E.S. 1986. Preliminary results of the 1984 U.S.-Japan Cooperative bottom trawl survey of the central and western Gulf of Alaska. In Major R. L. (editor), Condition of groundfish resources of the Gulf of Alaska region as assessed in 1985. U.S. Dep. Commer., NOAA Tech. Memo. NMFS F/NWC-106. p. 259-296. Cochran, W.G., 1977. Sampling Techniques. 3rd ed. Wiley Series in Probability and Mathematical Statistics - Applied. John Wiley & Sons. N.Y., N.Y. 428 p. Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott. 1991. Common and Scientific Names of Fishes from the United States and Canada. Fifth Ed. American Fish. Soc. Spec. Publ. No. 20. 183 p. Sigler, M.F. 1987. Scientific operation plan: 1987 triennial trawl survey for groundfish in the eastern Gulf of Alaska. Unpubl. Rep., 20 p. (Available from Auke Bay Laboratory, NOAA National Marine Fisheries Service, 11305 Glacier Hwy., Juneau AK 99801-8626. Snedecor, G.W., and W.G. Cochran 1967. Statistical Methods. Iowa State University Press, Ames, Iowa. 593 p. Stark, J.W., K. Mito, E. Brown and T. Yoshimura. 1988. Report to Industry: Results of the 1987 U.S.-Japan Cooperative Bottom Trawl Survey of the Central and Western Gulf of Alaska. U.S. Dep. Commer., Northwest and Alaska Fisheries Center Processed Report. NMFS NWAFC 88-15. 215 p. Wakabayashi, K.,R.G. Bakkala, and M.S. Alton. 1985. Methods of the U.S.-Japan demersal trawl surveys. p. 7-29. In R. G. Bakkala and K. Wakabayashi (editors), Results of cooperative U.S.-Japan groundfish investigations in the Bering Sea during May-August 1979. Int. North Pac. Fish. Comm. Bull.44. 165 APPENDIX A Gear Specifications and Diagram Figure A illustrates the Poly-Nor'eastern high-opening bottom trawl and roller gear used during the 1990 Gulf of Alaska groundfish survey. POL Y-NOREASTERN 166 Frlmln9 tmes 89'1"/1:10'7" FA HA ROLLER GEAR 81 '7" 89'1" Total itngth. 120 I~I " %"ubl~ 214" rubbe'r dl~1 TOP CORNER 3114" w1n9 bobb.n, SIDE PANEL JuBOTTOMCORNER BREAST LINES: CD 19'6" CD 19'6" @ 30'6" o S'8" ~--=- ~180 ••.. , ••.•bOP' d,SCs Restrictors: 5 ea., 14' circumference, made of 1y," pOly rope spliced to form Rings for splitting strap, a ring, hung 4' apart, secured loosely 5'1," diam" 5/8" galv. at top, bottom, and at riblines. ~ Top seam Ribline Liner sewn in Spiders: 54"X 'I." diam, about 97M braided nylon, 2 per ring, from end, each spider leg laced along bars. Figure A.- -Schematic diagram of the 90-105 polyethylene Nor'eastern bottom trawl, roller gear and accessory gear used during the 1990 Gulf of Alaska bottom trawl survey from 4 June to 9 September 1990. 167 APPENDIX B Strata Specifications and Charts Tables B-1 and B-2 and Figures B-1 through B-5 present survey strata of the Gulf of Alaska (170-132°W long.) used during triennial groundfish surveys of the shelf and upper slope. List of tables Paqe Table B-1 List of individual survey strata 168 Table B-2 List summarizing survey strata 170 Figure B-1 Shumagin strata 171 Figure B-2 Chirikof strata 172 Figure B-3 Kodiak strata 173 Figure B-4 Yakutat strata 174 Figure B-5 Southeastern strata 175 110Code10 2,2672,4014,9943,7664,2325,7694,102"5,0765,3715,5126,119(km%)7,59010,9488,3727,3197,80011,0827,6737,8738,4758,3628,03610,47115,3397,2997,4438,283Area8,61612,001120,469131,38210,99313,67814,625 Davidson NameMiddletonKenaiYakutatAlbatrossShumaginSemidiUpperLowerFoxSoutheasternNorthernChirikofYakatagaMiddletonEastShelikofSanakWestShumaginBaranof-ChichagofPrinceKenaiKodiakFairweatherBarrenYakutatChirikofAlbatrossPortlock Islandssubtotal Shumagin ShumaginPeninsula AlaskaCookFlats BankGully1,234 of IslandsOuterShallows38,30535,124 BankEdge FlatsBank OuterFlatsKodiakShallowsBanks WalesBank ShelfShallowsGullies Outer Shelf3,4992,2852,2133,1922,4412,1342,2743,2312,2372,4712,4382,3433,0534,4723,2053,9884,264.2,1282,1702,4152,5121,6821,1961,4801,5661,4561,0981,6071,784(nmP) Inlet ShelfShallows700661 Peninsula Shelf GullyShelf GullyShelf ShelfShallows Shelf 168 Area (m) 101-2001-100 9921511501341331431421211321401411301311229911111121202050353332313022211241401311 Depth Table B-l.- - Survey strata of the Gulf of Alaska (170-13rW long.) by depth, code, name and area. 993 YakutatShumaginUpperLowerCodeNameSoutheasternKodiakChirikofPrinceBaranof-ChichagofKenai5102104103102,2362,0102,0753,0181,8731,8973,1902,9602,5282,7371,7561,0051,3481,5501,0361,2241,6261,2761,7391,6331,533320,64812,96912,3273,4443,9993,59835,6917,8108096,729Area9,967subtotal(kg2) Gullies Shelikofof Slope SlopeDeepGullies Slope Wales Slope93,48710,4062,2773,5943,781 SlopeDeep(nmi2) Gullies Gully Slope2,9061,0041,1661,9621,049880293393452553605236302357474372507863476447737798546512652586930 GulliesSlopeGrand total 169 Area (m) 420 and area. 201-300701-1,000501-700301-500-: 994251232250230330996520995450440430350240341231220221550530540351241340320 Depth 1-1,000 Table B-l.- - (continued) Survey strata of the Gulf of Alaska (170-13rW long.) by depth, code, name ChirikofKodiakstatisticalAreaSoutheasternYakutatShumaginAllareas areas(nmP)3,0182,0102,7372,5282,2362,9602,964340,3411,6331,8971,87311,61612,93493,4871,3481,55023,7497,74826,5752,8844,90929,13311,500220,22114,5351,7561,0983,76611,545230,231,1,00516,83740,4144,3623,44468,04568,37239,84230-(kin')24,317320,64843,18157,3924,874240,241Area102,52255045050350,9,871150,1515,035250,251320420510440430520410210310530540330included12020Subareas13011014010 - 351 - 2233, 13 122134112143919929921931959Total949939951941Name911 35922912926924925916915914Code932913952934935933955936945946923956954953942943944 23229,89119,83919,93412,59016,7333,3534,2382,8783,3668,4946,9247,0901,0041,4681,421 880476553737452863546586798293512841652393864 170 (m) Depth 201-300701-1,000501-700301-500101-2001-1,000 1-1001-100 701-1,0001-1,000 1-1,0001-100 INPFC 1-100 Table B-2.- - Survey strata of the Gulf of Alaska (170-13ZOWlong.) by depth, code, INPFC statistical areas and area. "t? 56' N Bering Sea ,;r_ .....•..., [r""' =_~""\.,/"" (/ :Y rW'fJ'~':, .:~~.4" ( () /~~~\~ 112--' 12 v/ ~ "-- ~S"S/ N~IC>:\~~~aginf.UIIY ('1// Shumagin 0 - cz, 12 '.r Ji"· Z\ ~ I-' 0- --J __~/:'"("~r~:-.--'fl0\J 13rL-C:~1 ( '-=)V-~11O~huma~n \':I13 BanktJ ;/\ ; I-' \ -::::~~ 54' N ••• o '='=7=/~7'1J ~-~~--=>:;~S;;:;:~:::-;::::/ ~ 210Y{)~~~J!1..~...>-'~7j 410510 3-10 501-700701·1000101-200201-300301-5001-100HOO101-200ShumaginDavidsonLowerFoxI(m)WestShumaginSanak IslandsName Alaska Shumagin Gully Bank Bank OuterSlope Peninsula Gully Shelf . 164'W160'W166'W162'W Strata Legend Code 52' N 10 112310410510210110131112 1111 168'W Gulf of Alaska Depth I 170'W Figure B-1.- -Survey strata of the Shumagin INPFC statistical area shelf and upper slope in depths 1-1,000 m used during the 1990 National Marine Fisheries Service triennial groundfish survey. 172 58" N Stnl;a ~,nd Do",. Code em) 20 1·100 Uppn AJ.uJuo PrnilUoub 21 1·100 Semidi Bank 22 1-100 Chirikof Bank UO 101·200 Eut ShlUNlyn Gully Ul 101-200 Shrlikof Edge 122 101-200 Chirikof Ouler Shelf 220 201-300 Lawn Shrlikof Gully 221 201-300 OUrlkof 51o~ 32Q XI1·500 Chirikof Slop<' 420 501-'100 QUrikof Slop<' 510 701-1000 ChirikofSI~ 158"W 156"W 154"W Figure B-2.- -Survey strata of the Chirikof INPFC statistical area shelf and upper slope in depths 1-1,000 mused during the 1990 National Marine Fisheries Service triennial groundfish survey. 600 N ~'l> .~t;j q0~ ~'l> ~~'l>t;j 580 N I-' -...J W Slnt;!! Legend Depth Code (m) N;une 30 1-100 Alb 155°W 153°W 151°W 149°W 14rw Figure B-3.- -Survey strata of the Kodiak INPFC statistical area shelf and upper slope in depths 1-1,000 m used during the 1990 National Marine Fisheries Service triennial groundfish survey. 60° N 58° N I-' Gulf of Alaska -..J oJ:>. Depth ,.., 101-200MldcUftonShelf101-200101-200FairwrathtrShelf201·300301·500501-100301-500HODYakutatShallowl1-100Mlddl.tonYakublYakutat FlatlGuUles Shallows I- 201-300701-1000SSO'r'abtagaYakutatYakublYakuut NSm,. SlopeDttp ShelfLesendI Gullies 340 241 N~. ,',..I"1<114'341«0..<1 •• Cod. 147°W 145°W 143°W 141°W 139°W 137°W Figure B-4.- -Survey strata of the Yakutat INPFC statistical area shelf and upper slope in depths 1-1,000 m used during the 1990 National Marine Fisheries Service triennial groundfish survey. 58' N f--' -.J lJ1 56' N Strata Legend Depth Code (m) Name so 1-100 Southeastern ShaDows ISO 101-200 Baranor-Chlchagor Shelr IS1 101-200 Prince or Wales Shelr Gulf of Alaska 2SO 201-300 Baranor-Ch1chagor Slope 251 201-300 Prince or Wales Slope &. Gullies 350 301-500 Southeastern Deep Gullies 351 301-S00 Southeastern Slope 4.50 SOI-700 Southeastern Slope SSO 701-1000 Southeastern Slope 54' N 137'W 135'W 133'W 131'W 129'W 127'W Figure B-S.- -Survey strata of the Southeastern INPFC statistical area shelf and upper slope in depths 1-1,000 m used during the 1990 National Marine Fisheries .Service triennial groundfish survey. 176 APPENDIX C List of Animal Species Encountered Tables C-1 and C-2 list fish and invertebrate species encountered and identified during the 1990 Gulf of Alaska triennial groundfish survey. Fish are listed in phylogenetic order. Most common and scientific names are from Robins et al. (1991). Invertebrates are listed in phylogenetic order by phylum. Order of listings and common names used are for convenience and do not imply adherence to a particular phylGgenetic system. 177 Table Cl.- - List of fISh species encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Family Scientific name Common name Petromyzontidae unidentified lampreys Chimaeridae Hydrolaeus colliei spotted ratflSh Squalidae SQualus acanthias spiny dogfISh Somniosus pacificus Pacific sleeper shark Lamnidae Lamna ditropis salmon shark Rajidae Raja binoculata big skate Raia rhina longnose skate Bathyraja aleutica Aleutian skate Bathyraja parmifera Alaska skate Bathyraja interrupta Bering skate Bathylagidae Leuroelossus schmidti northern smoothtongue Leuroelossus stilbius California smooth tongue Osmeridae Thaleichthys pacificus eulachon Mallotus villosus capelin Spirinchus starksi night smelt Salmonidae Oncorhynchus tshawvtscha chinook salmon Oncorhynchus kisutch coho salmon Oncorhynchus keta chum salmon Oncorhynchus eorbuscha pink salmon Oncorhynchus nerka sockeye salmon Stomiidae Tactostoma macropus longfm dragonflSh Chauliodus macouni Pacific viperflSh Myctophidae Stenobrachius leucopsarus northern lampflSh Gadidae Theraera chalcoeramma walleye pollock Gadus macrocephalus Pacific cod Microeadus proximus Pacific tomcod Macrouridae Albatrossia pectoralis giant grenadier Coryphaenoides acrolepis Pacific grenadier Scomberesocidae Cololabis saira Pacific saury Scorpanenidae Sebastes alutus Pacific ocean perch Sebastes babcocki redbanded rockfISh Sebastes borealis shortraker rockfISh Sebastes brevispinis silvergray rockfISh Sebastes ciliatus dusky rockfISh Sebastes crameri darkblotched rockfISh 178 Table Cl.- - (continued) List of fISh species encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Family Scientific name Common name Scorpanenidae Sebastes diploproa splitnose rockfISh Sebastes elongatus greenstriped rockfISh Sebastes entomelas widow rockfISh Sebastes helvomaculatus rosethorn rockfISh Sebastes maliger quillback rockfISh Sebastes mvstinus blue rockfISh Sebastes melanops black rockfISh Sebastes nigrocinctus tiger rockfISh Sebastes paucispinis bocaccio Sebastes pinniger canary rockfISh Sebastes polvspinis northern rockfISh Sebastes proriger reds tripe rockfISh Sebastes reedi yellowmouth rockfISh Sebastes ruberrimus yelloweye rockfISh Sebastes variegatus harlequin rockfISh Sebastes wiIsoni pygmy rockfISh Sebastes zacentrus sharpchin rockfISh Sebastolobus alascanus shortspine thornyhead Anoplopomatidae Anoplopoma funbria sableflSh Hexagrammidae Hexagrammos decagrammus kelp greenling Hexagrammos stelleri whitespotted greenling Ophiodon elongatus lingcod Pleurogrammus monoptervgius Atka mackerel Cottidae Blepsias bilobus crested sculpin Dasvcottus setiger spinyhead sculpin Gvmnocanthus galeatus armorhead sculpin Hemilepidotus red Irish lord Hemilepidotus iordani yellow Irish lord Hemilepidotus spinosus brown Irish lord Hemitripterus bolini bigmouth sculpin Icelus spiniger thorny sculpin ]jeptocottus aramatus Pacific staghorn sculpin Malacocottus kincaidi blackfm sculpin Malacocottus zonurus darkfm sculpin Mvoxocephalus iack plain sculpin 179 Table Ct.- - (continued) List of fISh species encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Family Scientific name Common name Cottidae Mvoxocephalus polvacanthocephalus great sculpin Mvoxocephalus verrucosus warty sculpin Nautichthvs oculofasciatus sailfm sculpin Rhamphocottus richardsoni grunt sculpin Trielops forficata scissortail sculpin Trielops macellus roughspine sculpin Trielops pineeli ribbed sculpin Trielops scepticus spectacled sculpin Agonidae Bathvaeonus alascanus gray starsnout Bathvaeonus nieripinnis blackfm poacher Bathvaeonus pentacanthus bigeye poacher Podothecus acipenserinus sturgeon poacher Sarritor frenatus sawback poacher Cyclopteridae Acantholiparis opercularis spiny snailflSh Cyclopteridae Aptocvclus ventricosus smooth lumpsucker Careproctus melanurus blacktail snailflSh Eumicrotremus orb is Pacific spiny lumpsucker Paraliparis dactvlosus red snailflSh Bathymasteridae Bathvmaster sienatus searcher Zoarcidae Lvcodapus fierasfer blackmouth eelpout Lvcodes brevipes shortfm eelpout Lvcodes cortezianus bigfm eelpout Lvcodes diapterus black eelpout Lvcodes pacificus blackbelly eelpout Lvcodes palearis wattled eelpout Stichaeidae Brvzoichthvs mariorius pearly prickleback Chirolophis decoratus decorated warbonnet Lumpenella IOD1!irostris longsnout prickleback Lumpenus saeitta snake prickleback Poroclinus rothrocki whitebarred prickleback Cryptacanthodidae Delolepis eieantea giant wrymouth Lvconectes aleutensis dwarf wrymouth Anarhichadidae Anarhichas orientalis Bering woltrlSh Anarrhichthvs ocellatus wolf-eel Zaproridae Zaprora silenus 180 Table Cl.- - (continued) List of fIsh species encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Family ScientifIc name Common name Trichodontidae Trichodon PacifIc sandf'lSh Clupeidae Clupea pallasi PacifIc herring Ammodytidae Ammodvtes hexapterus PacifIc sandlance Pleuronectidae Atheresthes stomias arrowtooth flounder _ Eopsetta exilis slender sole Eopsetta iordani Petrale sole Errex zachirus rex sole HiPPol.!lossoideselassodon flathead sole HiPPol.!lossusstenolepis PacifIc halibut Microstomus pacifIcus Dover sole Platichthvs stellatus starry flounder Pleuronectes asper yellowf'm sole Pleuronectes bilineatus rock sole Pleuronectes isolepis butter sole Pleuronectes Quadrituberculatus Alaska plaice Pleuronectes vetulus English sole Psettichthvs melanostictus sand sole Table C2.- - List of invertebrates encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Phylum BalaQusArl.!is~roughargidunidentifIedscallophermitnotseaCommongiantNAClassScientifIc mouseavailable barnaclesp. Polychaeta sponge sponge name name glassbarnacles sponge unidentifIed spongesbrachiopodbryozoan PoriferaBrachiopodaBryozoaAnnelidaArthropodashrimp MvxillaTerebrataliaBalanusEualusSuberitesLegueusClass Hexactinellida sucklevi incrustans evermanni californianus fIcus transversa barnacles 181 Table C2.- - (continued) List of invertebrates encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Phylum Scientific name Common name Arthropoda Crangonidae family crangonid shrimp unidentified shrimp Craneon sp. unidentified crangon Craneon alaskensis shell shrimp Craneon communis common crangon Notostomus iaponicus spinyridge shrimp Pandalidae family Pandalid shrimp unidentified Pandalus sp. Pandalid species unidentified Pandalus borealis northern shrimp Pandalus hvpsiontus coonstripe shrimp Panda Ius iordani ocean shrimp Pandalus platvceros· spot shrimp Pandalus tridens yellowleg pandalid Pandalopsis dispar sides tripe shrimp Pasiphaeidae family Pasiphaeid shrimp unidentified Pasiphaea pacifica glass shrimp crab Acantholithodes hispidus fuzzy crab Cancer maeister Dungeness crab Cancer oreeonensis Oregon rock crab Chionoecetes sp. Tanner crab unidentified Chionoecetes .bairdi Bairdi Tanner crab Chionoecetes hybrid Tanner crab hybrid Chionoecetes tanneri grooved Tanner crab ChoriHa loneipes NA Oreeonia eracilis longhorned decorator crab Hvas sp. hyas crab unidentified Hvas lvratus North Pacific toad crab Labidochirus splendescens NA Lithodes aeQuispina golden king crab Lithodidae sp. stone crab unidentified Lopholithodes sp. box crab unidentified Lopholithodes foraminatus NA Munida Quadrispina NA Paguridae family hermit crab unidentified Paeurus sp. hermit crab unidentified Paeurus aleuticus Aleutian hermit 182 Table C2.- - (continued) List of invertebrates encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Phylum Scientific name Common name Arthropoda crab Pa2urus brandti sponge hermit crab Pa2urus cornutus NA Pa2urus capillatus hairy hermit crab Pa2urus dalli NA Pa2urus tri2onocheirus fuzzy hermit crab Paralithodes camtschatica red king crab Placetron wosnessenskii scaled crab Pu2ettia sp. kelp crab Rhinolithodes wosnessenskii rhinoceros crab Mollusca mollusks gastropods Order Nudibranchia unidentified nudibranch Tochuina tetraauetra giant orange tochui nudibranch Chlamvlla sp. chlamylla nudibranch Family Acmaeidae unidentified limpet Order Mega- & Neogastropoda unidentified snail Natica sp. unidentified moon snail Family Buccinidae unidentified whelk Arctomelon stearnsii Alaska volute Berin2ius kennicotti NA Buccinum plectrum sinuous whelk Buccinum sp. unidentified whelk Fusitriton ore2onensis hairy triton Fusitriton sp. triton unidentified Neptunea Ivrata ribbed Neptune .Neptunea Pribiloffensis Pribilof Neptune Neptunea sp. unidentified Neptunea Volutopsius harpa left·handed whelk Volutopsius sp. unidentified melon snail pelecypods (bivalves) Chlamvs islandica Iceland scallop Chalmvs rubida Hinds Scallop Chalmvs sp. pink scallops F. Pectinidae unidentified pectin scallop Patinopecten caurinus weathervane scallop F. Mytilidae unidentified mussel 183 Table C2.- - (continued) List of invertebrates encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Phylum Scientinc name Common name Mollusca pelecypods (bivalves) Mvtilus sp. unidentined Mytilus mussel F. Cardiidae unidentined cockle Serripes e:roenlandicus Greenland cockle F. Anomiidae false jingles unidentined Pododesmus macroschisma Alaska false jingle Compressidens stearnsii Stearns toothshell cephalopods F. Octopodidae octopus unidentined Octopus dofleini giant octopus Octopus leioderma smoothskin octopus Order teuthoida unidentined squid Berrvteuthis mae:ister magistrate armhook squid (red squid) Rossia paciiIca Pacinc bobtailed squid Echinodermata stariIsh Cross aster papposus rose sea star Crossaster sp. NA Ctenodiscus sp. NA Ctenodiscus crispatus common mud star Hippasteria spinosa spiny red sea star Luidiaster dawsoni NA Pteraster sp. cushion sea stars Pvcnopodia helianthoides twenty arm sea star Solaster sp. sun stars Solaster stimpsoni multicolored sun star sea urchins & sand dollars Subclass Regularia unidentined sea urchin Allocentrotus frae:ilis orange-pink sea urchin Allocentrotus sp. fragile sea urchins Brisaster sp. unidentined heart urchin Strone:vlocentrotus droebachiensis green sea urchin Strone:vlocentrotus franciscanus red sea urchin Strone:vlocentrotus purpuratus . purple sea urchin Order Clypeastroida unidentined sand dollar crinoids Order Articulata unidentined crinoid brittle stars Class ophiuroidea unidentined brittle star 184 Table C2.- - (continued) List of invertebrates encountered during the 1990 Gulf of Alaska triennial trawl survey, 4 June - 9 September 1990. Echinodermata brittle stars Gore:onocephalus carvi basket star Ophiura sarsi notched brittle star sea cucumbers Class Holothuroidea unidentified sea cucumber Cucumaria fallax sea football Parastichopus sp. NA Psolus sp. redscaled sea cucumber Chordata Class Ascidiacea unidentified tunicate Boltenia sp. unidentified sea onion Boltenia villosa NA unidentified compound ascidian Halocvnthia aurantium sea peach Halocvnthia sp. unidentified sea peach Class Thalliacea unidentified salps 185 APPENDIX D Length-Weight Regressions for Major Species Length-weight relationships for major species were calculated using a non-linear least-squares regression algorithm. The equation used for the regression was Weight (grams) a * Length (mm) b • List of plots Paqe Arrowtooth flounder 186 Flathead sole 187 Rock sole 188 Rex sole 189 Dover sole 190 Yellowfin sole 191 Walleye pollock 192 Pacif ic cod 193 Pacif ic ocean perch 194 Northern rockfish 195 Rougheye rockfish 196 Dusky rockfish 197 Shortraker rockfish 198 , 0r<"),'"T'r<") ,,,,,, "T' N L."""""-:O::'I.~""'"..•. ....oz=-r.~"'t- ~ a = '"'" 0I 2.9973,3353.3470.00000117180.000001079870230160+ 500600700400500600700300400300400500600700300 ao 0.0000087116= .~ + ... '0;000r<")111 = I + bN ~=0E '0;b0>~ =0 + 186 200 200 ~~ 0Males•11~-rT111I ~ITJ,:.J.., -t 1III, I t""'FT' " ., , o 1 lengthlength (mm) (mm) :<::<: TotalFemales 0 length200 vs~ weight'" 1:<: regression~l (weight(grom.) = a • lengthfmm)) d+ ARROWTOOTH0 ~lj FLOUNDER 187 FLATHEAD SOLE length vs weight regression (weight(groms) = a • length~mm») a,a 0.00000909720.0000050563IIII a = (f) 3.1543.0483.1770.000004396384208124 200200250300350400450350250300400450 b = + + N ~'"~v'ijja~aaE .".CD~,. 188 ....•. N = a +Nb IIa=E(f) .:::;.:::;~ -1 150 Totala :;::E Moles a Females a length (mm) a 150 = a I length vs weight regression~ ~ (weight(groms) = a • length~mm}) ROCKa SOLE : 1 190 DOVER SOLE length vs weight regression (weight(grom.) = a • lengthfmm}) N = + 0 + II,I, if I + / a = '"'" 0ITotalMolesT/3.253.4433.3970.00000227150.0000009358462146Females0450500550350400450500550350400 if b = 0 'iij0" 'iij0EN~ 0 + ••••. + ••• ,-... 2E 0 a = 0.0000007053 ., 3002 b en= ~10 length (mm) 10 +~ ~ I , lengthI, (mm) ~ ~ o ~ + I N av, 0.00005600080.0000053570.0000031,,,,, 388 T a = ...... '"'.,. + + - -: ~ N 2.7393.1663.25387840 200250300350400200200250300350250300350400400 .,. 191 b = + ~ a a ~a~ ., 0a ,, N = 150 CD~150 g 150 Nb = ~0.~E g aCD a = Females = E a a Ia/S:E I lengthlength (mm) (mm) a Moles Total a0 , length vs weighta regression0 (weight(gram.) = a • lengthfmm») ~ g 1 YELLOWFIN:j~j SOLE ~+ 192 WALLEYE POLLOCK length vs weight regression (weight(gram.) = a • lengthPmm») I I "~~""-- ... 00 3.2933.2953.2150.00000281670.00000167710.0000017103296157139 10004008006004006004006008001000 N = + 2 ~ 'ijj'ijj'iij-00It)0 I a = 193 - ~~" +" 200 Nb =~"200> 0 T ~I I I, I ~"T... ~+T 0-L-1 --;)~~ gE I °o~ lengthlength (mm) (mm) 200200° Total°MolesFemales 0=a = ° length vs weight regressionI (weight(gram'J = a • length~mmJ) PACIFIC0 COD 195 NORTHERN ROCKFISH length vs weight regression (weight(gramo) = a • length~mm)) N == 0.00001587170.00000967470.0000140359,I, , , '"'" 0 3.0853.0243.005469043 300400500600700 a =a = 0o '0;•..•...000E0~Q) 0 TotalMalesFemales +-,-~,~ 196 ~'~"~' b 0= ~25.2''"~ n I I 200I 200, I ::c 10 lengthlength (mm) (mm) length vs weight regression (weight(gram.) = a • length~mm}) o ~ ~ ~ ~ [[ ROUGH EYE[ ROCKFISH 197 DUSKY ROCKFISH length vs weight regression (weight(gram.) a • lengthfmm}) T b = b = "' 0I~I() f Moles+ II,,, .•. a = b += .•. a +=+ + + ~ E C!'0> NI()+"' ,,0+3.323.3293.46444993I +~ ~ ~400450500400450500500400450 0.00000102260.0000023507 0.0000025511 0 E ... + ~ 'Qj'Qj0C!'EN- -! ";;) 350 0 :c 0~ 350 :c ~~- ~ TotalFemales0 + + lengthlength (mm) (mm) N = , ~j 350 § 1 + ::L 1 198 SHORTRAKER ROCKFISH length vs weight regression (weight(grams) = a • lengthfmm}) to ++ + +' , .... 000.0000612340.00001277750.0000+ 144505,,,, b + (J) ~ C7'(J)(J) 2.7973.0423.027549541TotalFemalesMoles+600700800+ = aa N = 0 ~ 0~ 'wE0N~ '" 0 N =a == 0 ++ ~C7' E0~ 00 0 + ,...... 1:C7' b 0 500 0 Nb .!?= ~ = 0 lengthlength (mm) (mm) ~.+ 500 , , ~.+~ + ~ ~j + I :J:1 199 APPENDIX E Catch Per Unit Effort and Biomass Estimates by Strata for Principal Species Appendix E presents estimates of catch-per-unit-effort (CPUE) and biomass for the most dominant species. Estimates of variance and confidence intervals do not incorporate variation associated with measurements of effort. CPUE is measured in kilograms per square kilometer (kg/km2) area. Estimates are given for each strata in which catch occurred. Catches are ranked in descending order. The strata are defined in Appendix B. List of Abundance Tables Table Paqe E-1. Arrowtooth flounder 201 E-2. Pacific halibut 203 E-3. Flathead sole 205 E-4. Rock sole 206 E-5. Rex sole 207 E-6. Dover sole 209 E-7. Yellowfin sole 211 E- 8. Walleye pollock 212 E-9. Pacific cod 214 E-10. Sablefish : 215 E-11. Pacific ocean perch 216 E-12. Northern rockfish 217 E-13. Rougheye rockfish 218 200 Table Paqe E-14. Dusky rockfish 219 E-15. Sharpchin rockf i sh 220 E-16. Short raker rockfish 221 E-17. Shortspine thornyhead 221 E-18. Redstripe rockfish 221 E-19. Harlequin rockfish 222 E-20. Silvergray rockfish 223 E-21. Redbanded rockfish 223 E-22. Yellowmouth rockfish 224 E-23. Yelloweye rockfish 224 E-24. Rosethorn rockfish 224 E-25. Alaska plaice 225 E-26. English sole 225 E-27. Butter sole 226 E-28. Starry flounder 226 E-29. Pacific herring 227 E-30. Atka mackerel 227 E-31. Red squid 227 ShumaginFoxLowerDavidsonAlbatrossSemidiUpperChirikofNKenaiMiddletonYakutatYakutatYakatagaAlbatrossWestPrinceKodiakFairweatherPortlockBarrenShelikofEastSanakChirikofKenaiShumaginMiddletonSoutheasternBaranof-ChichagofUpperSE Kodiak630.763573.415107.662 Islands24.77323.97378.14711.90210.16122.8594.957 Deep1.317.5512.12411.1916.151.01547.36424.26070.4689,840.48752.402148.6051.167217,8162.219.6163.542.17823.6442.82644.46221.2385.890.18035.62313.10358.1435.030.4435.565.93153.31614.65691.977100.0431.0883.4952.8721.467651.69010.9182.2721.425241.7362,1854.5841.495284.4878.2421.066638.6157.7811.5631.574466.11113.0411.525.68938.7841,945.86016.70615.46312.6051.71E+104.5601.1054.3243.980.59966.3282.858129.7984.6588.348.979130.9289.327880.25921.14516.33325.9562,597,0832.08E+075.5651.814.68934.05016.24551.8547.2827.3047.3472.588.34088.1746.83636.46528,0102.3701.631136.59513.6526.96820.3361.733125.6419.3092.02E2.48E2.73E+077.427820.7776.52113.3661,3851.880166,16625.71214.293VarianceBiomassLower1.11911.7641.20444013.02049225.833Hauls26230915.801898.38917.7603.0443212.294kg/kmof ShumaginPeninsula5623.78277.6534,9822.9207.0433725939008021.889 Alaska233.99333.386Cook13.6164176.9328131.381214.9967.9672.13813,7956724133.1021.036.42823.5496.71140.387272355.9692.625.21719.0394.6921193345336712221523971518593118381437.13110122.65262.6641236 Shumagin108.6842067131618285.003193.361name104.01548.631127.717BankC.I.C.I.175,36860.739101.882FlatsUpper Gullies6826.37784.92345.494191.80076.91081.311 ofGullyShelikof334171496114385202568519289.954227.838958684 Bank155.452118.647139,692Islands0Shallows1.0270Outer49.00102.2855050321 Slope51023878313.244035.67824928.9622.40455.521CPUE36.47712.84460,111244catch4.3310 FlatsBankShallowsOuterSlopeDeepGullies0 EdgeBanksFlatsShallows0036.50400 BankIt}0Gullies WalesShallows0 ShelfGullies +OuterShelfSlopewithCPUE Inlet07 Shelf08 Pen Shelf Slope Gullies Shelf Gully ShelfSlopeGully Shelf Slopeof haulsNumber292410132328206827 1236181416101968479 251 201 -:: 134 Baranof-ChichagofShelfKodiakLowerE-1.- Shelikof Slope - Total number Gully of survey hauls. hauls containing arrowtooth flounder. CPUE.variance of CPUE.biomass and biomass 31034021022241351320330350251240code25015132221341230142132112111141231143150220121110232131130120133122140211241403533201331301110 confidence intervals. based on the NMFS 1990 Gulf of Alaska groundfish survey. by strata. Strata Table MiddletonDavidsonShumaginFoxLowerYakutatUpperAlbatrossChirikofSemidiKenaiNWestBarrenYakatagaBaranof-ChichagofShumaginMiddletonYakutatPrinceFairweatherEastShelikofChirikofAlbatrossSanakPortlockLowerKenaiUpperKodiakSESoutheastern KodiakE-2.- Islands79,29714,85717,6692,009 Deep246,7004,4644,8242,7635,315,80732,5826,2432,3314,3573,342151,1413,1591,059551,3717,1261,899292,1401,027,9711,8041,5336,1196,0102,8151,4274,61447,39335,0214,14550,70534,35138,41954,21671,53658,1662,82685,27077,08227,05944,42964,35754,4262,5201,07851,4421,02879,2821,4291,31479,9771,682234,3458,5381,8242,2913,159662,08648,46122,57674,34610,48823,7527,2074,6459,77025414,6401,2341,2481,9632781,5161,9091,335205,569Hauls198,4046,0507,5773287,8701,555186154,99116,76910,85622,6826,026 Shumaginkg/kmof150Peninsula7,8465,1671,47721,90242,80710,74957,0977458,10513,6758,33919,01221122750156 Alaska30,91012,50413,63014,43714,26411,91545134561 Cook4248ShumaginC649617639208978935522782291,10962169422411321218262215388146352,4812,21625991441828,2313,18413,893 Flats15,16911,02419,31519,21810,20610,4606,655UppernameBank1,9256,5754236Gullies1,90110,2004,2501,2968,67626453688905673376357347624991,5337,0774,986212316842,9097,6253,07012,1817,4923,0067,9238,2734,6314,7022,4086,9967,0616,2912,57010,01320,0499,1893,16137,9652,633 ofShelikofGully1,97671001327901032020519 Islands4448456,328Bank0Shallows4,305 Outer850234450716094304520Slope-20,563CPUE830264205catch0 .1.C.1.919OuterFlatsBankCPUEVarianceBiomassLower Slope00 ShallowsDeepGulliesEdge FlatsShallowsBanksTotal Bank0ShallowsGulliesIt} Wales ShelfGullies OuterShelfSlopewith Inlet ShelfPen Shelf Slope GulliesShelf number Gully SlopeShelfGully Shelf ShelfSlopeof haulsof surveyNumber2924231018682036131912 142816271368479521 hauls, hauls containing Pacific202 halibut, CPUE,variance of CPUE,biomass 11224035034134025021210251231232351code14114015014224114313213315122022123013011112212012111013413132334041222030353111131012 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table 9178032728179233945211243361900 of hauls 68 ShumaginFoxLowerUpperAlbatrossNChirikofSemidiYakutatKenaiMiddletonLowerDavidsonWestYakatagaAlbatrossSanakShelikofShumaginBaranof-ChichagofYakutatKodiakMiddletonBarrenPrinceEastPortlockFairweatherChirikofKenaiUpperLower KodiakE-3.-109,278 Islands30,33822,13710.46613,11415,0434,3594,0951,749,33230.4797,77853,1801,313126,3966.453170.4558,9806,2861.71E+7,0751,2185,3518,92749,5247,5593,91348,6587,2351,343212,84368,17439,36661,2017,17332,0926,83050,3202,53054,6515,7161,9629.47091,0652,62050,7981,11513,1462,632965,77011,13112,3661,1231,745488468Hauls12,3214,9722,5367.407126,9575,6842,3641,081594,0615,745329,80922,306614102,1.913158,380735kg/kmof Shumagin1902,704135Peninsula9692093,74540,67412,3534,9003124145635460711,9461715829078 Alaska201711,20610.47118,76810,548 CookShumagin3181112347C33077302501662020731102,53422243234562336539183414310229882556910499542233114181018745186511172577749,6983,9222.42711,2332980597name9;00310,0041.404C.I. FlatsBank1,793UpperGullies3863179284282,0295777797565134295480392,69011261001038,588813,6787,88916,8182,15708,55036,062Gullyof1,988 Shelikof300231,6877,1273,784115104365IslandsBank0338 Shallows0475Outer54,624Slope CPUE-catch.1.0 ,319OuterFlatsShallowsSlopeDeepGulliesEdge FlatsShallowsBanks000 Total Bank(t)WalesShallows ShelfGullies OuterShelfwithCPUEVarianceBiomassLower 07Inlet Shelf Pen Shelf GulliesShelf number Gully Gully GullyShelfSlope Shelf Shelf ofNumber survey29242023131028291227143618101319 12698756419 hauls, hauls containing flathead203 sole, CPU~, variance of CPUE, biomass 3302411501341512513402211421214312230231230code24011114132211101402322201211321121301311201334140223110211113203335 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table ShumaginLowerFoxDavidsonUpperChirikofSemidiAlbatrossYakutatLowerKenaiMiddletonWestBaranof-ChichagofBarrenMiddletonKenaiChirikofFairweatherSanakShelikofEastPortlockKodiakShumaginLowerE-4.- Islands40,18238,5724,6813,8502,5831,2181,251,09413,3906,9593,8118,1911.486343,2725,6171,8261,0541,14328,65045,21332,0981,8291,692423,3571,05147,9778,4442,152105,44418,53912,75024,3282,270314,77234,81916,97152,6671.4971,0561.42217,05755,7361,336470,54116,71263,0841,936Hauls360164,36026.47615,11937,8333,7203,8929.4321,024397kg/kmof Shumagin1,1691,2925,9472,6872,0494,664Peninsula92 Alaska237118,95112,086 Shumagin4CCook2517101122311772572242115363327291428222379112584,8031812213043C.I.nameUpper FlatsBank45562221603923283312987842118634212304713861330401291091,8892,3093.485025302,6511,7521,00421,116 Gully208104072760618286091010,35111,06085504720535711 IslandsShelikof0BankShallowsOuter CPUE-catch0.1.0 OuterBankEdge Flats0BanksTotalShallows BankShallowsIt) OuterShelfwithCPUEVarianceBiomassLowerSlope Inlet Shelf Pen Shelf . Shelfnumber Gully Gully Gully Shelf Shelfof haulsofNumber survey2924232820681213101914 18769859 hauls,36 hauls containing rock204 sole, CPUE, variance of CPUE, biomass 1321401332102201501221433140code1121301101311201341211113233214122203012101113 -:Albatross Gullies and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table ShumaginLowerFoxDavidsonUpperAlbatrossNSemidiYakutatChirikofMiddletonKenaiWestBaranof-ChichagofAlbatrossYakutatYakatagaPrinceFairweatherSanakBarrenShumaginKodiakEastMiddletonKenaiShelikofChirikofPortlockUpperSELowerSoutheastern KodiakE-5.- Islands27,42310,460 Deep4,088568,9841,4644,6172,2923,7853,2124,140192,0421,1953,3333,2691,9902,7481,3982,09414,8181,4062,4587,62531,3481,57934,7441,67684,04648,8125,6247739,9013,46762,6225,0221,0039,0401,144533,4361,2521,1651,2581,64317,00622,4491,55522,5721,35411,08529,83458,3304,6751,45115,316330901Hauls4,2311,909249274124,73210,6175,31215,9215,8692,647113 Shumagin3276,223kg/kmof1645,9961,0662,5146,4584,5712,5966,546Peninsula2677215,776442815461653833,3858393381557252791,7201,10865114547243 Alaska13248 CookShumagin521174731116224205873428728C22136152017012223718171291129517132153110000495819581272851661220617219378075516054173931649413694301,903176,41714,9178,22921,604231117026014133382,0049,2453,66316654name Flats8,324C.I.Bank1,3625,572UpperGullies951652274810775279828006241727630654253482771012802,7135,9933,28809,0223,324Biomass0999024011LowerGullyofShelikof2400499996243241342879777836019473736668402570521 ,8701,50815206066554,770871Islands0326002670508ShallowsOuterBank0617 SlopeCPUE-580475258056994catch0.1. OuterCPUEVarianceFlatsShallows0SlopeDeepGulliesBank EdgeFlatsTotalBanksShallows0BankGulliesIt) ,400WalesShallows GulliesShelf OuterShelfwithSlope .Inlet Shelf Pen Shelf SlopeGullies Shelfnumber Gully Gully ShelfGullySlope Shelf ShelfSlopeof haulsof surveyNumber23242968181320362810271412 13161910697485219 hauls, hauls containing rex205 sole, CPUE, variance of CPUE, biomass 14113014231034123235024034033024132015114332351250code13222125111214023012212121011011113412013312133115020211122010231131354122333040 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table of hauls LowerUpperYakutatAlbatrossNSemidiChirikofMiddletonKenaiShumaginWestAlbatrossShumaginShelikofBaranof-ChichagofEastSanakBarrenFairweatherChirikofYakutatPrinceYakatagaPortlockMiddletonUpperSELowerSoutheasternKenaiKodiak KodiakE-6.-26.40426.217 Deep498.5269.3042.7732.3586.2707.159117.9483.36001.0622,5601.2573.0651.4811,1101,7422,71220.06846.4901.42583,1871.028542.73110.24264.4751,09515.49810.69526.30827.8002.37124.6921.7153893.04114.35457.1731.68314.5033.8902.1805,6001.1171,18815,38919,044481422Hauls8461.7092813752252517,1281.3775.2811,0433,1376.926125492667982313726681kg/kmof2,039 Shumagin1456.3769.7693.8231.5791567.635481Peninsula1,4452.040373349219411.2641.0228118632.4732.7411.5271811165958958.4673325372570851112155 Alaska1712,781 Shumagin446418965001124431307224,142C.!.C.!.65664471054626.06818001910011101218858330331.12172.9508.7884.48713.08863222.020211.64514.7857.87621,695191.17548.6359.1675.553263.60513184291628512165785549172.860181261260243.1979,0871.5781740445name Bank41,138Upper4662Flats31598128855105713607701758515Gullies635916.14206545603880084882.766 GullyofShelikof25208501.50289890309373466420203626530 Islands0BankShallows68711061203460850 OuterCPUE34247110Slope-589157catch00CPUEVarianceBiomassLower FlatsOuterSlopeDeepGulliesShallowsEdge0 FlatsShallowsBanksTotal Gullies(t)WalesShallows GulliesShelfBank OuterShelfwithSlope Shelf Pen ShelfSlope Gullies Shelfnumber Gully GullyShelfSlope Shelf ShelfSlope ofNumber survey1329202368281324101436191227181316 106895417295 hauls. hauls containing Dover206 sole, CPUE. variance of CPUE, biomass 1312322102411513111031022111215021330341251320351code111250143122240230120231121134133141204014213132340220121303501403341353022 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey. by strata. Strata Table of hauls ShumaginAlbatrossDavidsonLowerUpperChirikofWestEastE-7.-105.72414.7166.131134,3825.3233.0746.9975.3947.6891.23E+073.8221.7271.65722.5502.2114.0931.039033.2692.57930.33238.6201.712Hauls5086.230302112kg/km7.851of155 ShumaginAlaska CookShumaginC.I.C.I.271.700name44207Upper33372151268318931165124BiomassLower6830 Bank045.636 CPUE-764catchCPUEVariance0 Bank ShallowsBanksTotalBank0It) with Inlet Pen number Gully Gully ofNumber survey2923681013141079 hauls, hauls containing yellowfin207 sole, CPUE, variance of CPUE, biomass 12code12011220313022111332 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey. by strata. Strata Table LowerDavidsonAlbatrossFoxShumaginSemidiChirikofUpperNKenaiMiddletonYakutatWestAlbatrossYakatagaSanakEastShelikofPortlockBarrenMiddletonKenaiBaranof-ChichagofFairweatherYakutatShumaginChirikofPrinceLowerKodiakSEUpperSoutheastern KodiakE-8.-119,740167,987147,294105,812 Islands38,85696,86153,21220,72720,28518,98316,01012,94610,796 Deep4,456,27438,6571,8874,2284,778,2856,8733,360398,34710,7185,12916,3061,595,2827,9237,89923,2305.60E+075,6616,126,04162,2332,946121,5205,5187,453,0511,243,7487,2314,5311,7394,9371,008360,7068,5471.66E+1.26E+071.00E+071,074,12127,5284,58450,4721,2311,467557,5131,485344,4384,063116,8045,8331,854129,4313,3347,3133,3943,134184,3862,8961.30E+2,2172,0971,8994,6481,1709,1706,4053,383,12039,1914,2772,224302,37122,16810,1043,4571,463,28826,5247,0982,52042,53641,3604,3151,612210,65112,5735,05220,0943,338233,95436,5472,744851,0422,0191,44838,1884,5591,088194,5764,34913,5313,9283,11756,8595,43621,7612,4841,267198,4004,5601,2657,855383,80172,254Hauls1.39E+07618,2759,58511,4851,420588,62510,1521,1743503708,7239,205of4,4712,3071,0983,516kg/km ShumaginPeninsula7,7678,0722984748019929519539094 Alaska12333,94245,9501982 Cook446C7Shumagin331863,50113122034,231111926123527812768142763219156898650352357C.I.4847,53006,93314163name Bank122,713241,41525,5642,185Flats1,564Upper14,88131351270598Gullies998496657715424,2365,37943,0931,0600103 Gully20,0866,230of45Shelikof9340182,064891359 Islands720Bank6,01862718001,571 OuterShallows58,79261,71045,71058,506CPUESlope60945317,963-19,6746470510695catch1108010.1.1,9200 BankShallowsFlatsOuterSlopeGulliesEdgeDeep BanksFlats0ShallowsTotal BankGullies(t)ShallowsWales ShelfGullies ShelfOuterwithCPUEVarianceBiomassLowerSlope Inlet07 ShelfPen ShelfSlope GulliesShelf number Gully GullyShelfSlope Shelf ShelfSlopeof haulsof surveyNumber293610282368202418131927 1416121069 517248 hauls, hauls containing walleye208 pollock, CPUE,variance of CPUE,biomass 25013035031032021340code35134133011114324115015125122113422024021013212123214211014012213113314123123011240120324113331022311135123020 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table LowerShumaginFoxDavidsonAlbatrossNYakutatUpperLowerChirikofSemidiKenaiMiddletonYakatagaWestChirikofAlbatrossShelikofYakutatMiddletonFairweatherBaranof-ChichagofKenaiPortlockPrinceSanakKodiakBarrenEastShumaginSEUpperLower KodiakE-9.-173.800 Islands54.80133,64215.35110.93017.806 Deep4.489.3193.84E+075,0266,6162.2264.979122.52011.5612.95820.1641.054151.2462.3901,353624,8552.0745.9311,115.5531.9411,0562.6371.754.09716,1382.4581,344.98727.02125.32432,9192.40220,36230,5922.1877788.4235,11882.1134.7351,1338.3371.140229.05711.3661.217167,7555,1531.3378.9681.721469.8008.5921,4422.3852.934587.35640.12918.66061.5982.552259,77220.51112.03728.98674.99320,14533.26835717,6781.92760419.2246.2724.1908.35521.865458.3491.588Hauls1,220217533241263150.4052,3858.9554812,2411.1318.618 Shumagin9,5731.6496,0962.4522,7223,758kg/kmof7.1952.5861.1963.9763,810333.9155.4363.1047709638214.38572.538Peninsula5.9371.9878578003816 Alaska661434.45654466 CookShumagin7129415914332416542838510231.41480.32815.4859.04921.9204C153428375712419263162134592,621240.83729.04818.18439.913350852.5211.1843.8581917183.468C. Flats012.446nameBank82961.37015.815UpperGullies3511797713591.537818.156210022.1199.7818,15816.7346.624 Shelikof020.5508.48132.619Gullyof62733202027591007493961.04073.771 ,9303.080IslandsShelikof329989564724272126Bank7.801ShallowsOuter026,6099.64843.571 CPUE-93703146086648.289Slope37.406catch.1. Outer0CPUEVarianceBiomassLowerGulliesSlopeFlatsShallowsBank EdgeFlatsShallows0 TotalBanksI.003.1330GulliesBankIt) WalesShallows ShelfGullies OuterShelfwithSlope Inlet Shelf Pen Shelf Shelfnumber Gully Gully GullyShelfSlope Shelf ShelfSlopeof hauls of surveyNumber292423281336681018122014 1627191386974519 hauls, hauls containing Pacific209 cod, CPUE, variance of CPUE, biomass 35031024014221250code23024123221014014123125122014315111013332150221130134132121120111131112122353341201340313022101112 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table UpperYakutatAlbatrossKenaiMiddletonDavidsonWestAlbatrossYakutatShumaginChirikofBarrenEastShelikofPortlockKodiakMiddletonBaranof-ChichagofSanakPrinceFairweatherYakatagaLowerUpperKenaiSESoutheasternYakutatE-10.-82,98517,57217,02610,705 Deep444,1155,9454,594,869273,0083,994324,8944,3064,330246,610158,2038,5409,5001.03E+3,3775,5033,2201,0961.4341,0077,9921,8093,60832,5972,32687,5605,6215,250,27341,9442,06478,2021,09249.40933,9151,960290,8874,0681,6836.4538,24315,18059,1327.4033.41852,5601,3471,08318,0714,3312,19116,01516.48315,8054,14414,9852,378220,109614,332Hauls422607,3006651,6021,0228057,256 Shumaginkg/kmof2445786538,0675,524Peninsula1,7604,3449493.4794,83121191374293082390568386183202646011099,32175,557942611031 Alaska110047960220 Shumagin4C.I.C.I.116274276,9272116192559625236912215530331349106010675526315322213332536202187802824103106.4711name1,3614Upper FlatsGullies87938800540723341187259354614494948559768316311237408,237112340131242,14313,0031.47224,534°2,768Gullyof41284587553846830Islands Shelikof8087064,0441,0617,0273,667°ShallowsOuter1,3452841,680036208916400 CPUE53,77941Slope97118135,9593360878730catch0° ,3880FlatsOuterDeepGulliesSlope EdgeFlatsBanksShallows -°GulliesBankIt) WalesShallows GulliesShelf Total,1426,727OuterShelfwithCPUEVarianceBiomassLowerSlope 07 Shelf Pen Shelf Slope GulliesShelf Gully numberGullySlopeShelf Shelf ShelfSlopeof hauls ofNumber survey2923242068272918122813361014191610146495872 hauls, hauls containing sablefish,210 CPUE, variance of CPUE, biomass 2301121102411421513102511413111351341350code2102311323302321332211431222501301211341204041320203401112202401501401313033 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table ShumaginLowerFoxSemidiUpperAlbatrossKenaiDavidsonWestYakatagaYakutatAlbatrossShumaginShelikofBaranof-ChichagofFairweatherPortlockChirikofMiddletonEastPrinceKodiakBarrenSanakSESoutheasternKenaiE-11.- Islands21.92645.495.5.35087.37619.97812.23618.91418.429 Deep2.2232.769,1641.799201,1143.9552.721.26718.0662.915.2462.5483.463.31219,9174.2136.1932.005.3004.0051.6571,550,0522.3102.4498.6801.3977,7485.6193,1546.7778,905115.375110,1032,6052.4317.0263.3408.706.0636.9301.4194.9802,24821.4702.22248.8821.3192.74616.94242995.7904.08E27.6691.31412.5952.04377VarianceBiomassLower25.29a75.4983,124386,7533.8234.621Hauls832.39117.5802455.6631.1027,0181,063186698kg/kmof Shumagin4521897.559Peninsula1.27536420257110 Alaska192775151435,6217212962475 Shumagin3145892C8170104181379235011422732364873698224230511265622215211521146415739181.127459,1068.253name115029515291404723C.I.20317617159 Bank4463431767244Upper4140Gullies981403525922224891444.03712795153504252.7820550382.3310.1970Gullyof52649 .8931420411649Islands516048302890414Outer9,11401.011 SlopeCPUE323088427.97642catch2.0280.1.3.90606.4153.0329,797CPUE FlatsOuterSlopeDeepGullies EdgeFlats0Banks -0GulliesBank WalesIt) ShelfGullies TotalOuterShelf+withSlope08 Shelf Pen Shelf Slope Gullies Shelf Gully numberShelfGullySlope Shelf ShelfSlopeof hauls ofNumber survey2928276824201013233618121619141046929.57 hauls.2912 hauls containing Pacific211 ocean perch. CPUE. variance of CPUE, biomass 2411323203301101401301333103120code332511212301134024014223115113111214314112013422134121111350250210103511221501213 . Kenai Flats 220 -:Lower Shelikof Gully and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table DavidsonLowerFoxShumaginUpperAlbatrossSemidiMiddletonYakatagaWestAlbatrossBarrenShelikofSanakMiddletonKenaiShumaginEastChirikofKodiakPortlockYakutatUpperE-12.-.9.768143.242 Islands37.00110.58630.20654.6681.612952.28223.5701.6722.008.1211.4011.1096.55E+0776.7411.9641.111.40214.37319.36.61.2661.170Hauls10.637263kg/kmof Shumagin2.347312342580687210529097002242814036 Alaska191310180005018 Shumagin0647C28240428111252233280111061236021217273124040854935713516254104111122207name FlatsBankUpper2221303423146658013367Gullies37325622470627644542768326078012216014351139092615551.2603.6359111152152250692 GullyShelikof52602900983174 IslandsOuter4300 CPUESlope53.737catch13.439 .I.C.I.CPUEVarianceBiomassLower0Outer SlopeBankGulliesEdgeFlats0 Banks-BankIt) Shallows ShelfGullies TotalOuterShelfSlopewith Pen Shelf Shelf Gully numberGully Shelfof hauls ofNumber survey2924231018362013682428271219965459 hauls. hauls containing northern212 rockfish. CPUE. variance of CPUE. biomass 2403201342412301322321411302314111212113311020code122210140312111121012011122113113 and biomass confidence intervals. based on the NMFS 1990 Gulf of Alaska groundfish survey. by strata. Strata Table of hauls ShumaginDavidsonUpperAlbatrossYakutat"MiddletonKenaiYakatagaWestAlbatrossSanakYakutatPrinceEastChirikofKodiakKenaiPortlockFairweatherBarrenMiddletonShelikofBaranof-ChichagofShumaginlowerSEUpperSoutheasternE-13.-26,6942113,31811,50613,230 Deep3,5914.455,80510,6303,5678,761,9035,824225,6674,7751,395,8893,3207,9781,3321,2502,6651,5221,0251,34321,12710,98986,3652.47220,9521,715368.4092,10094,2211,1961,3881,640Hauls2221,3051656,592176150 Shumagin5,8411,6434,7072075,1696,032kg/kmof1619,6431,0624817,6201.414Peninsula239160531,1072,6101,2683,72029515383572050434471.4581096428391,7882220588501137865651101062 Alaska141512446010381171705563686405301784 Shumagin77540128415842194866C2050927461322423908815171513263224121376313,20182557631181156475612118111870631name1,3351.4655 FlatsGullies43Upper61229981196289522986484022953056081131657412772339302002993112221of023500985,773Gully3353550924390713158 Shelikof3212620559Islands54515993169790481 ShallowsOuter650247Slope CPUE201051044406090catch4 .1.C.1.01,078OuterCPUEVarianceBiomasslowerFlatsGulliesSlopeBank0 DeepEdgeFlats0 -ShallowsBankGullies(t) WalesShallows ShelfGullies TotalShelfSlopeOuter with ShelfPen Shelf Gullies ShelfSlope Gully numberGullyShelfSlope Shelf ShelfSlope ofNumber survey68102329362013271228191624181410 64986572 hauls, hauls containing rougheye213 rockfish, CPUE, variance of CPUE, biomass 330110134111.251250151122340150230142221210231143141132404135023211code 35124022024111212013031014013112134113332013302033 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table of hauls ShumaginLowerFoxDavidsonAlbatrossChirikofMiddletonYakutatWestAlbatrossFairweatherEastShumaginShelikofYakatagaBaranof-ChichagofMiddletonKodiakChirikofBarrenUpperLowerKenaiPortlockE-14.- Islands24.71410,6884,2523,2882,7292,999158,6816,387190,9563,5271,7181,84648,9875,0711112,24522,9241,7351,9421,5801,636216Hauls2531,29912,370kg/kmof776204 Shumagin87321152825214903412328096855611701390160441238099 Alaska19010029 CookC.I.C.I.552577023826127522520165444Shumagin2472112223332192054927321593218192906021044280701579130name179015Upper41,7991,983,8539,134 Flats327515316252220731803323031035500113Gullies22639120305201545251372608221238258904171079Shelikof1Lower87066633 ,4281,3555410404ShelikofIslands0501 BankOuter760245830001 CPUESlopecatch94500CPUEVarianceBiomass FlatsOuterSlopeGulliesBank Edge -BanksBankIt) Shallows GulliesShelfFlats TotalOuterShelfSlope with Inlet Shelf Pen Shelf Shelf Gully numberGully Shelf ShelfSlope ofNumber survey292423682013361828191027141210964759 hauls, hauls containing dusky214 rockfish, CPUE, variance of CPUE, biomass 134220250241132112133210230232240141121221122.3111231code3214310120130111411422213140150 13112 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey. by strata. Strata Table YakatagaAlbatrossYakutatBaranof-ChichagofPrinceKodiakFairweatherPortlockMiddletonKenaiBarrenSoutheasternSEChirikofShumaginLowerChirikofE-15.-E-16.-49,91414,846 Deep463,8152,237280,1392,748258,5221,173269,0661.4678,6022,8571,2882,6691.12E9,7374,1627.4201,06013,88621,1461,37513,5851.49519,1881.459Hauls398,5236,910356168,2541,3359191,0772714,673285120kg/kmof2141132,7451711122,3146,6872880313157100139277166053117936556606014010C0103233012369105.407819280602731110342351002603001103110205133,1081,165,6463,80621,217724,14598538983756name10381722828447930101111311911900416 FlatsUpper456Gullies91,1988235413213076289345311521611503559920103611637350477812313040Lower15265602564210of299355Islands Shelikof17409250708Outer21,6250750Slope CPUE90805625030catch .1.C.1..1.C.I.0CPUEVarianceBiomassFlatsCPUEVarianceBiomassLower SlopeGulliesDeepFlats -0GulliesSlopeIt) Wales+ ShelfGullies TotalShelfwithSlope07 Shelf ShelfSlope Gullies Gully numberShelfSlope ShelfSlopeof hauls ofNumber survey29282718233613101916141227 64927 hauls, hauls containing sharpchinshortraker215 rockfish, rockfish, CPUE, CPUE, variance variance of of CPUE, CPUE, biomass biomass 230341210142251341350330130132231320340151132133351240231210220131143140'320code350310240351340134150143141151330241250 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Table Strata Table of hauls MiddletonMiddletonBaranof-ChichagofYakatagaShumaginPortlockPrinceFairweatherYakutatKenaiSoutheasternSEChirikofKodiakE-17.-E-18.-36,88015,292 Deep323,1331,4832,3533,436,89213,5751,6531,2485,3764,4363,3982,179129,1792,3041,1651,283,5024,780135,7892,8748,9132,7366,204152,4561,6301,2691,7084,55060,0522,04157,7431,56936,53623,65711,7931,74323,3152,05115,582Hauls19,6081,142154,159129,1541,292394235322968kg/kmof6,6627,6531,4327,8081653,2851893,1246532,1713712881292,1511,92236663171,1335558542629822824811503716213830261147815360C87262291349081698355302675126163581225941145012872691141346701614511name1,3181359013 FlatsUpper582726834262116812402878727GulliesBiomass1368120Lower1,319 of4343480959714644306983694201384095751402,90904101,3380800383 OuterCPUESlope9960737catch5510 .1.C.1.0CPUEVarianceFlats DeepSlopeGulliesFlats0 -Gullies(t) WalesShallows Shelf TotalOuterShelfwithwithCPUEVarianceBiomassLowerSlope Shelf ShelfSlope Gullies numberShelfSlope Shelf ShelfSlope ofNumber survey2927182813241619121014 46927 hauls, hauls containing shortspineredstripe216 rockfish, thornyhead, CPUE, CPUE, variance variance of CPUE, of CPUE, biomass biomass 351151111133140240141133134250143142151131330code25034132035023024122131025134021014323114015025115041 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table Table of hauls ShumaginUpperMiddletonKenaiYakatagaAlbatrossYakutatShumaginMiddletonFairweatherBarrenBaranof-ChichagofShelikofEastChirikofKenaiPortlockPrinceKodiakSEE-19.-E-20.-24,63016,054 Deep439,3015,193261,5042,174165,9853,7719,8913.454118,3211,5392,312,2817,811161,2559,2041,1921,6312,3052,2052.4332,11?23,39026,9901,38927,3551,521Hauls515227 Shumagin326592347kg/kmof147105Peninsula39922207 Alaska742045111722177231044204013745469469C2232362902211963509322200552012101171121515616431581117name09761,03151344109 FlatsUpper44556818604074666Gullies2624350942502222286690627205525824139234709720215153121176122104620341005010020886110301001021003010952316227911410110401211011180241 of3040943376049304,156 Islands03,687Outer SlopeCPUE909catch5270 .I.C.I..1.C.I.0CPUEVarianceBiomassLowerFlatsOuter08,003Slope0 GulliesDeepEdgeFlats -BankGulliesIt) WalesShallows ShelfGullies TotalOuterShelf with ShelfPen Shelf Gullies Shelf Gully numberShelfSlope Shelf ShelfSlope ofNumber survey242310206829282716361318 191012146949 hauls, hauls containing harlequinsilvergray217 rockfish, rockfish, CPUE, CPUE, variance variance of of CPUE, CPUE, biomass biomass 34135012112014213425124023034023125012112213113011114313234015025024120141133413313code14014313315122125115041241131 and biomass confidence intervals, based on theth~ NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table Table of hauls YakutatYakatagaYakutatWestEastKenaiPortlockChirikofBaranof-ChichagofShumaginFairweatherPrinceMiddletonSoutheasternSEKodiakE-21.-E-22.-E-23.- Deep3,575210,2781,8345,7031,38620,3121,2184,1942,0715,1031,519VarianceBiomassLowerHauls1,396461kg/kmof297 Shumagin200494142613815016269137142006628122407405017 ShumaginC2390205266018942170231440922912724985385884113568325016994663972155791225898920.159C.C.I.2224058name11590492 FlatsUpper4Gullies217843372345011221608992581225658322650533111110610193414591201411170225684208416302708527285201315181001002070140 of23906011751034010503165720200455Shallows CPUE820272Slopecatch.1. .I.C.I.0FlatsOuter DeepSlopeGulliesFlats -I.(t) WalesGullies Shelf TotalOuterShelfwithCPUEVarianceBiomassLower withCPUE Shelf Slope Gullies Shelf Gully numberShelfGullySlope Shelf SlopeShelf ofNumber survey682928271824 1213161014196298 hauls,20 hauls containing redbandedyelloweyeyellowmouth218 rockfish, rockfish, CPUE, CPUE, variance variance variance of CPUE,of CPUE, biomass biomass biomass 120142133251143150340120230341112121141122350240141351131231241151111150140133250code25123015140 - Shelikof Edge and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata TableTable Table of hauls ShumaginDavidsonLowerChirikofAlbatrossUpperYakutatMiddletonBaranofWestYakutatAlbatrossEastMiddletonPrinceSanakKodiakFairweatherShumaginBaranof-ChichagofBarrenKenaiLowerSESoutheasternE-26.-E-24.-E-25.- Deep4,2922,6878,9321,7706,8973,34184557,8292,76915,7031,31982,5402,4061,56417,0821,8441,071682Hauls1,5463891,322746kg/kmof169 Shumagin491665836565398096712142174055415237109810403582307429Alaska861416115583808418120391052 Cook973ShumaginC4315223010480252150464802314044511261962201385372615015723358296291734name012C.1131571001391264014 FlatsC.I.169Upper83250322364431325229474032112054111126223421570174116250243011090261233,25042130Lower3880900147Gullyof567205140114 ShelikofIslandsBank03170538ShallowsOuter0 -ChichagofSlopeCPUECPUE.(t)catch.1.003,373 FlatsCPUEVarianceBiomassLower0SlopeBank -BanksI.BankGullies(t) WalesShallows GulliesTotal OuterShelfwithCPUEVarianceBiomasswithCPUEVarianceBiomassLowerwith Inlet ShelfPen Shelf Slope Gully numberGullyShelfSlope Shelf ShelfSlopeof hauls ofNumber survey29132368101612243610181913 14979286 7 hauls, hauls containing AlaskaEnglishrosethorn219 plaice,sole, rockfish, CPUE, CPUE, CPUE, variance variance variance of of CPUE, CPUE, of CPUE, biomass biomass biomass 251351142231150350251134120143151132111110241250220151150133130401231code1114011232313~111322412013 Lower Cook Inlet and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata TableTable Table name of hauls DavidsonLowerShumaginUpperAlbatrossChirikofYakutatLowerMiddleton-ShelikofMiddletonYakatagaBarrenPortlockFairweatherAlbatrossPrinceKenaiYakutatKodiakUpperE-27.-E-29.-E-28.-23.03217,16212,39918.783343.1695,577482,6034,7324.3893.7598.7209.851195.8243,7423.115178.3823.0652.4242.1451.0141.11520,92858,69829.2881.49710.2397.0401.0557.21259.9083,5807.483VarianceBiomassLowerHauls1.8222452077.7271,936342873kg/kmof5306667.5102.168449122404814030 Alaska5901228531111331027090 CookC4465232902072110357667414341083602169661125292662420561392402801C.C.\.14432133411nameUpper21102187 Flats65265369673117017315201214696211802123062511523016701411721241605231070173253553452102.91751262431231001.1145626100101,259093100114 ofShelikof329073303,7509.5966870 IslandsBankShallows05.767 OuterCPUEcatch0.1. .I.C.I.0CPUEVarianceBiomassLowerCPUEBank GulliesEdgeFlats BanksShallowsI.-BankIt) ShallowsIt)Wales ShelfGullies TotalShelfwithCPUEVarianceBiomassLowerwith Inlet Inlet Shelf Pen Shelf Gully numberShelfof hauls ofNumber survey29231014201328361927 107985 hauls. hauls containing starrybutterPacific220 flounder. sole. herring, CPUE. CPUE, CPUE. variance variance variance of CPUE. of of CPUE. biomass biomass biomass 1341302321321512401411311431331211304120303140code20140323013412232403111121132224030 and biomass confidence intervals,intervals. based on the NMFS 1990 Gulf of Alaska groundfish survey,survey. by strata. Strata Table Table of hauls DavidsonFoxNUpperKenaiYakutatShelikofYakatagaShumaginBaranof-ChichagofPrinceKenaiMiddletonBarrenChirikofLowerUpperSoutheasternSEKodiak KodiakE-30.-E-31.- Islands92,453 Deep3,5331.21E+1,3971,7621,2771,4161,073Hauls1,5551.2111,0064,7039,493kg/kmof143145148194 Peninsula2444919005374522936019240353833041208243390337313074500154151071270321 Alaska141861177534818180055151411270040126243040100093947214203029022611060231C3653114012525150469121103471286638149532462495130119915108517223123324111012029name14C.I. Flats81UpperGullies263047246103070752012221303435455130of5420 Shelikof19304791240368414012234209Islands790030,438570222 SlopeCPUEcatch.1. FlatsSlopeShallowsBankDeepGulliesEdge - 0GulliesIt) Wales Shelf TotalOuterShelf withCPUEVarianceBiomassLowerSlope 07 Pen Slope Gullies Gully Gully numberShelfSlope Shelf ShelfSlope ofNumber survey29242023241018192716141213 647296519 hauls, hauls containing Atkared221 squid, mackerel, CPUE, CPUE, variance variance of CPUE, of CPUE, biomass biomass 111241231151150142121240210221250330251220340320230141310341140121133132331035code1123235135020111 and biomass confidence intervals, based on the NMFS 1990 Gulf of Alaska groundfish survey, by strata. Strata Table Table RECENT TECHNICAL MEMORANDUMS Copies of this and other NOAA Technical Memorandums are available from the National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22167 (web site: www.ntis.gov). Paper and microfiche copies vary in price. AFSC- 48 NARITA, R., M. GUTTORMSEN, J. GHARRETT, G. TROMBLE, and J. BERGER. 1994. 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